Leveling with half of a Lynx block??

I use plywood with a thin sheet of rubber stapled on.

In dirt or sand I use my shovel.

I have a set of these which should solve your problem.

1/2 inch leveler

1/2 a block out of level isn't going to harm anything, though if you find it annoying I guess that's something.

With a motorhome, all I have to do is add one to only one wheel position rather than two in order to get half a step. If you have dual axles on the trailer, maybe something similar would work, adding a block to only one of the two axles on a side. The suspension takes up the unevenness.

I switched to the Andersen Camper Leveler awhile back and am very pleased for all but extreme leveling situations. I put a big level on the front of my trailer and simply watch it as I pull onto the levelers. Way faster than the lego style blocks or boards. The only situation I have had difficulties using this product on is slick surfaces (which I seldom camp on anyway), where the levelers sometimes slip. A piece of rubber mat under each leveler solves this. Now I just use the lego blocks under my stabilizers.

Go with the 3 blocks that you feel are a little bit too high.

Dig into the ground where you place these blocks until you get the height you need. Sometimes just a little scraping of the ground is all it needs.

If you're worried about the fridge, don't be. Half a block won't matter.

1/2 Lynx block off will not hurt anything. If you have tandem axles putting a block under just one will achieve a 1/2 block adjustment.

I use 2X6's cut, beveled, & stackable. And I'll use one block of I need some fine tuning, it doesn't hurt anything.

You are not building a house that has to be plumb and square, you just need for your frig to work right.