I'm with Wildman as far as the likelihood of "boxes on sticks" rolling anywhere, tho I do prefer the wheels stay on the ground, especially the rears.
Our old driveway was heavily off level, both side to side and front to rear.
It was tricky avoiding lifting a wheel, or sometimes even both wheels on the downhill side.
I would always completely dump the air, then very carefully level in manual as low as possible, and typically I was able to keep all 4 on the ground.
I always put the slides out in the driveway, levelled or not, never had a problem, though the big slide makes me nervous regardless, moving slow, moaning and groaning. But never had a problem. Unlike most, Monaco specifies moving the slides only when up on the air bags, not after levelling. I've done both ways, the slides don't seem to care.
My first moho, lost a dometic side by side fridge 2 weeks after purchasing it, blame it on parking it unlevelled in the driveway with the fridge on. Never again. If the fridge is on, the bus is either level or moving.