[maple_leaf_eh]

For a long time in remote Canada, sleds were a common oversnow, farming and woods-work feature. They don't need a smooth hard surface road. They are low to the ground for equipment like generators, welders, tool boxes, etc. Stable to tow to a job site. Easy too for one or two men to load objects like supplies, fuel cans, logs, stones, or dead animals. Easy to build with a couple of long planks and some sort of perpendicular deck. And above all - cheap to make and replace. Research "stone boat" and "komatik".

Putting wheels on something that might move a few miles/kilometers over its lifetime might be a misuse of effort. Likewise, inflatable tires might be just another problem to resolve when you need the utility out of the trailer the most. Perhaps the only advantage of a waist high bench is the worker doesn't need to bend at the wait.