This is a rather simple leveling block that is designed to be nested. I use for smoker and designed so that I could level each wheel to get things nice an level, one block is basically solid and meant to be the main one, the next is designed so that if you need to build up the height you can add one layer at a time until you are where you need to be.

There is a wheel well in each block to assist with the wheel to sit in the middle as well.

Support is needed to the second block, and comes out a little rough unless you use a different material for support interface .

You could also simply scaled the first block to width and height needed if you know what you need for a simply solid block.