The prettiest camp sites are often on a slope. I carry three 10 packs of these, and am considering adding more:
They hold up OK, but I've seriously dented a couple of them. I'll also use locally sourced logs and rocks.
Our bed is set up so that our heads are in the very back next to each other. Years ago I tried to level both the front and the back of the van. It turns out that that's a waste of time. Given where we sleep, I just need to level the back, and we're fine. That realization saved a ton of work and required fewer blocks.
I keep thinking that there must be some way to put a small jack inside my suspension to make this work, but I have not figured out how.
Edit: I tried using stacks of sections of 2x8, but you really need to screw them together if you want to pull onto a significant pile of them without them flying every which way. At that point the giant lego pieces start to make sense.