Late winter is when the ground lies at its worst. Irrigated feedlots in the Free State have had months of traffic compacting the surface unevenly, and any fresh scraping leaves a soft, unconsolidated layer that a loaded spreader will sink into if the axle geometry and tyre setup are not right. This is exactly where the twin-axle trailed spreader earns its keep, and where single-axle units begin to cut ruts that turn into a drainage problem by the time spring arrives.
The physics are straightforward. A given loaded mass spread across two axles produces a lower load per wheel than the same mass on one axle. Lower load per wheel means lower tyre contact pressure, and lower contact pressure is what keeps you floating instead of digging. The catch is that the twin-axle layout only delivers that benefit if the load is actually distributed across both axles. Fill discipline and hitch geometry both affect this. Get either wrong and you end up with one axle carrying most of the weight while the other floats free, which is nearly as bad as a single axle and considerably harder to diagnose.
How Load Shares Across the Twin-Axle Layout
On a tandem-axle trailed spreader, the load distribution between the two axles is not fixed. It shifts as the hopper empties, as the tongue angle changes relative to tractor hitch height, and as one wheel rides over a mound while the other drops into a scraped hollow. That constant variation is why tyre selection matters as much as axle count.
The 2010 SLC comes standard with flotation tyres. That is worth noting because the order documents confirm that the 425-22.5 tyre is listed as a downgrade option at added cost, meaning the standard fitment is already chosen with ground pressure in mind. Flotation tyres on a tandem setup give you two contact patches per side, each one wider and longer than a conventional tyre. On soft irrigated ground, the combined footprint is substantial. The practical result is that a fully loaded machine can cross ground that a similarly specified single-axle spreader would tear up.
Where operators get into trouble is by treating tyre pressure as a set-and-forget number. Flotation tyres are designed to run at relatively low pressures, and the correct pressure changes depending on total loaded mass. Running them hard because someone topped up the air and never adjusted it again eliminates most of the ground-pressure advantage. Check the tyre manufacturer’s load-inflation chart for your actual loaded weight, not the maximum rated load, and set pressure accordingly every season.
One practical note on tyre wear: tandem axles on a trailed machine are not the same as on a truck or trailer with a turntable. The rear axle on a fixed tandem scrubs during tight turns because it cannot steer. On the hard surfaces of a concrete feed alley this is minor. On soft ground it can create lateral gouging if you are turning at full lock with a heavy load. Keep turning radius generous when the hopper is full, and save tight manoeuvring for when you are running light or on firm ground.
Hopper Fill Discipline on Soft Ground
The 2010 SLC sits in the 2-Family grouping of the 20 Series side discharge range. It is designed around a large-diameter auger and expeller, and those components need a consistent material column to work efficiently. The temptation on soft ground is to run partial loads to reduce total weight, which is sensible up to a point. But there is a floor below which you are not actually protecting the ground and you are starving the auger of the material density it needs to turn pen-packed manure into an even spread pattern.
A better approach than simply running half-loads is to consider where in the lot you load and where you discharge. Load from the firmest available surface, ideally a scraped concrete apron or a compacted access lane. Then drive to the application zone and spread from the outside of a soft area inward, so you are always moving onto ground you have not yet crossed rather than reversing over wheel tracks you have just cut. This is a simple habit that makes a meaningful difference on lots that have had irrigation cycles in the weeks before spreading.
Filling discipline also affects the weight balance between axles. Loading heavily over the rear axle shifts weight rearward, lightens the front axle, and increases tongue load on the tractor hitch. Loading centred or slightly forward keeps both axles engaged and gives the tractor’s rear wheels better traction. Most pen-packed manure is loaded from above with a front-end loader, and loader operators tend to drop material wherever it falls. It is worth spending a few minutes training whoever does the loading to fill centre and front first, then work backward. It takes less than a season to become habit.
For operators looking at how the 20 Series spreaders are built and what the full side discharge range includes, the side discharge spreader range covers the full model lineup with specifications by capacity.
Hitch Setup, Tractor Ballast, and Hydraulic Control
The 2010 SLC comes standard with a swivel hitch. On uneven feedlot surfaces this is not just a convenience feature. A fixed hitch on ground with lateral undulation transmits twisting loads from the spreader frame directly to the tractor drawbar and hitch assembly. A swivel hitch lets the machine roll independently of the tractor, which protects both machines and keeps the tongue load more stable through rough ground. The option to specify a non-swivel hitch exists at the same price, but on soft or irregular lots the standard swivel configuration is the right choice.
Tractor ballast is the factor that most operators underweight when planning for soft-ground work. A loaded spreader behind an underballasted tractor shifts weight off the front axle, reduces steering authority, and makes the tractor skip rather than pull when ground pressure under the rear wheels exceeds traction. The general rule for rear-mounted and trailed implements is that front axle load should not drop below about 20% of total tractor operating weight. If you are running a spreader that is heavy at the tongue, check front axle load before the season opens. Suitcase weights or a front loader kept in the raised position can recover steering feel quickly.
Hydraulic control habits matter on uneven lots in ways that operators rarely discuss. The hydraulic deflector shield on the 2010 SLC is standard. On soft ground the instinct is to drop the deflector low to push material tight to the soil surface and avoid any windborne scatter. That is correct in terms of spread placement, but it also means the machine is working harder against material resistance. Smooth, consistent hydraulic flow to the expeller and deflector keeps the spread rate even. Jerky or variable flow, especially on tractors with older open-centre hydraulics, can cause surging in the spread pattern. If your tractor has a flow control valve on the remote circuit, set it to a consistent flow rate rather than leaving it fully open and relying on operator feel.
Tongue height also influences how the swivel hitch loads both axles. If the hitch point is set too high, the front of the spreader lifts and the rear axle carries a disproportionate share of the load. If it is set too low, tongue weight pushes down hard and the front axle of the spreader digs in. Aim for the spreader to sit level when fully loaded and hitched, which usually means matching tractor drawbar height to the nominal hitch height of the machine. It takes ten minutes to check at the start of a season and it changes everything about how the machine tracks through soft ground.
The deflector shield and splash guards come standard on the 2010 SLC, and both are worth keeping in place for soft-ground work rather than removing them for convenience. Splash guards in particular keep the tandem tyres cleaner during spreading, which reduces the risk of carrying wet manure out onto concrete alley surfaces and creating a slip hazard.
What the Twin-Axle Layout Cannot Do
Tandem axles reduce ground pressure. They do not eliminate it. A heavily overloaded spreader on wet, recently irrigated ground will rut regardless of axle count. The flotation advantage of the twin-axle layout is real, but it is additive to sensible load management, not a substitute for it.
The other limitation is turning radius. Twin-axle trailed machines are longer and less manoeuvrable in confined yards. If your lot has sharp corners, tight gateways, or infrastructure obstacles that require frequent sharp turns while loaded, a single-axle machine may actually cause less cumulative ground damage by completing the job in fewer passes. The argument for single-axle layouts in tight yards is worth reading before committing to either configuration.
For operations planning equipment for the season ahead, LEO Agriculture recently expanded the spreader lineup with models suited to a wider range of lot sizes, which is relevant context if you are evaluating whether the 2010 SLC is the right capacity for your operation or whether a step up or down makes more sense for spring conditions.
The practical takeaway for operators setting up for spring is this: confirm your tyre pressures against actual loaded weight, train your loader operator on fill placement, set the hitch height so the machine sits level under load, and keep the swivel hitch in the standard configuration. None of that requires extra capital. It just requires doing the checks before the first spreading run of the season, not after the first rut appears.
