The bus we just bought had Trailer jacks mounted on the bumpers. Not something to lift the bus but they work great to tweak the bus level. I think they'd more qualify as stabilizer's than an actual leveler setup. I have yet to come across a campground that needed more than a 2x12 under the tires and some tweaking from the stabilizers when I used my camper. After some time using the bus I can report back on how well they work. I've had the bus less than a week.