Silage Trailers for Sale: A Buyer's Guide for UK and Ireland Farmers

Silage season is the most time-pressured operation on any livestock farm. A self-propelled forager running at full output can fill a trailer in under three minutes. If your trailers cannot keep pace, the harvester stops, the contractor's clock keeps ticking, and every minute of delay risks the weather turning. The gap between a well-run silage operation and a chaotic one often comes down to the trailers behind the harvester, not the harvester itself.

Forage quality degrades rapidly once grass is cut. The goal is to move material from field to pit as quickly as possible, with minimal compaction losses in transit and efficient tipping at the clamp. A trailer that is slow to fill, awkward to tip, or prone to spillage on the road extends every cycle and chips away at the dry matter you are trying to preserve. Over a two-day first cut, those losses compound into real feed value.

Field conditions add another dimension. Silage trailers spend their working life running across soft ground, often in wet conditions, before transitioning onto the road for the haul to the pit. A trailer that sinks in the headland or tracks badly on the road creates problems that ripple through the entire operation. Ground damage from heavy, poorly balanced trailers can take a full season to recover.

Reliability matters just as much as capacity. A breakdown during silage season can knock a trailer out for hours or even days. With most farms cutting first-cut grass in a narrow window between late May and mid-June, there is rarely time to source replacement parts or arrange repairs before the weather changes. Trailers built with heavy-gauge steels, reinforced pivot points, and proven hydraulic systems reduce the risk of mid-season failures that can derail an entire cut.

Choosing the right silage trailer is about more than just volume. It is about matching your trailer fleet to your harvester's output, your field-to-pit distances, and the ground conditions you typically work in. Getting that match right means your harvester runs continuously, your pit crew stays busy, and your silage gets sealed before the weather closes in. Our silage season preparation checklist covers pre-season inspections and planning to help you arrive at first cut fully prepared.

Silage trailers broadly fall into three design categories, each with distinct advantages depending on the scale of your operation, the distances involved, and how you manage the clamp.

Rear-door tipping trailers are by far the most common silage trailers in the UK and Ireland. The trailer body tips hydraulically, and the load discharges through a hydraulic rear door (often called an "up-and-over" door). This design is straightforward, mechanically reliable, and fast to empty. A well-designed rear-door tipping trailer can discharge a full load in under 30 seconds, which keeps cycle times short. The hydraulic door provides controlled opening, preventing the entire load from rushing out at once and allowing the driver to place material precisely at the clamp face. Chieftain's grain and silage trailers use this proven format: a heavy-duty chassis with hydraulic up-and-over rear doors, engineered for the repeated tipping cycles of a full silage season.

Moving floor trailers (also called push-off trailers) use a hydraulic moving wall or conveyor floor to push the load out of the rear, rather than tipping the body. The main advantage is stability: because the body stays level, there is no tipping risk on uneven ground or slopes near the pit. Moving floor systems also allow unloading at lower heights, which suits operations where overhead clearance is limited. The trade-offs are higher purchase cost, greater mechanical complexity, and slower discharge rates compared to a tipping trailer. Moving floor designs are more common on the continent than in the UK and Ireland, where rear-door tipping trailers dominate.

Standard tipping trailers without a dedicated rear door (where the tailgate swings open or is removed entirely) are sometimes pressed into silage service. These work adequately for small-scale operations, but they lack the controlled discharge that a hydraulic rear door provides. Material tends to rush out in an uncontrolled mass, making it harder for the pit crew to spread evenly. For contractors or farms running more than a few hundred acres of silage, a purpose-built silage trailer with a hydraulic rear door is the better investment.

For a broader look at tipping trailer designs across agricultural and commercial applications, see our tipping trailer guide.

Farmers who grow cereals alongside livestock frequently ask whether a single trailer can handle both grain harvest and silage season. The answer depends on understanding the different demands each crop places on the trailer.

Grain is heavy and dense. A cubic metre of wheat weighs around 750 to 800 kg. Silage, by contrast, is bulky and comparatively light: chopped grass silage typically weighs 200 to 250 kg per cubic metre. This means silage trailers need high-volume bodies to carry worthwhile loads, while grain trailers need structural strength to handle concentrated weight. A trailer designed purely for grain will be too small in volume for efficient silage work. A trailer designed purely for silage may lack the chassis and axle ratings to carry a full load of grain legally.

The practical solution is a trailer engineered for both applications. Chieftain grain and silage trailers, including the GT series, are designed with this dual-purpose requirement in mind. The GT 23/34 combines a high-volume body for silage, peat, and root crops with a heavy-duty chassis rated for the concentrated loads of grain harvest. The hydraulic up-and-over rear door handles both free-flowing grain (where controlled discharge prevents spillage) and packed silage (where full door opening allows rapid emptying).

Running a trailer that handles both seasons has clear financial advantages. Rather than maintaining separate fleets for June silage and August grain, a dual-purpose trailer earns its keep across the full growing season. For mixed farms and contractors who move between enterprises, this versatility reduces the total number of trailers required and simplifies maintenance and storage.

There are limits to the compromise. Very high-output combine harvesters filling 20-tonne loads of wheat will push any dual-purpose trailer hard. Equally, contractors running six or seven trailers behind a large forager may benefit from dedicated silage bodies with the absolute maximum cubic capacity. But for the majority of farms across the UK and Ireland, a well-specified grain and silage trailer is the most practical and cost-effective option.

One further consideration is the rear door seal. Grain requires a tight-sealing tailgate to prevent losses during transport, while silage benefits from a door that opens fully and quickly under hydraulic control. The up-and-over hydraulic door design used on Chieftain's GT range addresses both requirements: sealed during transport, with fast full-width opening for discharge at the pit or grain store.

The most common mistake in silage logistics is running too few trailers for the harvester's output. When the forager has to stop and wait for an empty trailer, the entire operation stalls. Contractors typically charge by the hour, so harvester downtime is money wasted. Worse, it extends the time your cut grass lies in the field wilting beyond the target dry matter percentage.

A modern self-propelled forager running in heavy first-cut grass can produce 80 to 120 tonnes of material per hour. A large contractor machine in ideal conditions can exceed 150 tonnes per hour. To keep up, you need enough trailers in the cycle to ensure one is always being filled while others are in transit or tipping at the pit.

The calculation is straightforward. Work out the round-trip time for each trailer: loading time in the field, travel time to the pit, tipping and turnaround time at the pit, and travel time back to the field. Divide the total cycle time by the loading time, and you have the minimum number of trailers needed to keep the harvester running without pauses.

For example, if loading takes 4 minutes, travel to the pit takes 6 minutes, tipping and turning takes 3 minutes, and travel back takes 6 minutes, the total cycle is 19 minutes. Dividing 19 by 4 gives 4.75, meaning you need 5 trailers to keep the harvester running continuously. In practice, most operations add one extra trailer as a buffer for delays, breakdowns, or slower drivers.

Field-to-pit distance is the biggest variable. Operations where the pit is adjacent to the fields being cut might manage with 2 or 3 trailers. Farms hauling silage 5 miles down the road will need 5 or 6. Contractors working across multiple farms should plan for the longest haul distance on each job.

Trailer volume also matters. A larger trailer carries more material per trip, which reduces the number of cycles needed and can allow you to run fewer trailers overall. However, larger trailers are heavier, put more pressure on soft ground, and require more powerful tractors. There is a balance between trailer size and the tractors available to pull them. For most UK and Ireland dairy and beef farms, trailers in the 20 to 34 cubic metre range offer the best combination of capacity and practicality.

One factor that is often overlooked is tipping speed at the clamp. If trailers queue at the pit because the loader cannot spread material fast enough, adding more trailers to the field cycle does not help. A fast, clean-tipping trailer with a reliable hydraulic rear door keeps the pit flowing and prevents bottlenecks that cascade back to the harvester.

Road speed also affects the calculation. Trailers rated for 40 kph behind a fast-tow tractor will complete road hauls significantly quicker than those limited to 25 kph. On longer hauls, the difference in cycle time can be equivalent to needing one fewer trailer in the fleet. Factor in the speed capability of both tractor and trailer when planning your numbers.

Chieftain Trailers have been manufacturing trailers at their factory in Dungannon, Co. Tyrone, since 1969. The agricultural range includes dedicated Chieftain grain and silage trailers built for the demands of modern harvesting, where reliability across thousands of tipping cycles is non-negotiable.

The grain and silage range centres on the GT 23/34 and dedicated grain and silage trailer models. Each features a heavy-duty chassis designed for repeated high-load tipping, hydraulic up-and-over rear doors for controlled discharge, and high-volume bodies sized for maximum carrying capacity. The trailers are engineered for the transportation of grain, silage, peat, and root crops, giving operators genuine versatility across the full agricultural calendar.

The heavy-duty chassis is a defining feature of Chieftain's approach. Where some manufacturers adapt lighter frames for silage work, Chieftain apply their commercial trailer engineering expertise to every agricultural model. The result is a chassis that absorbs the punishment of running across rutted headlands, loaded to capacity, day after day through silage and harvest seasons. The hydraulic up-and-over rear door provides fast, controlled discharge whether you are tipping free-flowing grain at the store or packed silage at the clamp face.

For smaller operations, or farms that need general-purpose tipping year-round with occasional silage duties, Chieftain's dump trailers in the SB and HP series offer an alternative. The SB range covers capacities from 12 to 25 tonnes, while the HP series uses Hardox 450 steel bodies for superior abrasion resistance. These are not dedicated silage trailers, but their tipping capability and robust construction make them a practical choice for farms that need a versatile trailer across multiple jobs, with silage as one of several seasonal tasks.

Every Chieftain trailer is designed and built in-house at Dungannon, with options that can be tailored to individual requirements. Whether you need a high-volume silage body for a large dairy platform or a dual-purpose grain and silage trailer for a mixed farm, the Chieftain team can specify the right model for your operation. Contact us to discuss your requirements or request a quotation.