Welcome to the forum.
I laid out a gravel pad for my Class A in the back yard directly behind my driveway. I used 4X6 post for the outer edge held in place with steel rebars through drilled holes. The yard was reasonably level so did not have to worry about leveling. Next I pulled up the grass, laid out black plastic and had gravel hauled in (mid size). It has not settled much since I put the plastic down to keep the moisture from soaking in and the grass/weeds from growing out. I put my MH tires up on treated boards off the gravel.
It costs me very little to do it this way.