Carry a shovel and some leveling blocks for the camper. It doesn’t take too long to learn to read the terrain where you are parking, dig down a little for one wheel and stack the blocks for the wheel on the opposite corner. You want the camper to be level anyway.
I love the idea of a gimble, but I imagine it would be pricey to buy one big enough to hold the GF.
This was an idea that struck me as quite feasible (from the second that @AhnoldZ posted above)