Hive stand legs sinking into wet ground — slabs, gravel or a pallet on bricks before the winter rain?

Devon, fourth year, seven hives on a field edge that turns to soup by December. My stands are timber frames on four legs and every winter they sink unevenly. By February half the hives are tilted backwards, which is the wrong way. Options I'm weighing before the rain properly arrives. Paving slabs under each leg, which is easy but I suspect they'll just sink as a unit in soft ground. A gravel bed dug out and filled, which is proper work but drains. Or scrapping the timber stands and going to pallets on concrete blocks, which is what the farmer suggested and which looks ugly but seems to work for everyone who does it. The things I care about, in order: entrance never sitting in water, a forward tilt maintained all winter so condensate runs out, and not having to lift hives in January to re-level anything. What's holding up on genuinely wet ground? And does anyone bother with a weed membrane and gravel pad round the whole stand, or is that just pretty? I've also got a feeling that timber legs sitting in wet soil is why I replaced two stands in five years.