[Fulltiming]

I used to carry 8-2'x2' pieces of marine grade plywood (which I painted with primer) that is about 3/4" thick (a 4'x8' sheet cut into eight pieces). I would stack 3 of those in a slightly staggered arrangement on the ground in front of each front tire (always seemed that it was the front that was low) so it was easy to drive up on. That allowed the full tire to be supported and raised the front up 3" on each side which was usually enough to get the excessive slope light to go off. If I was off further than that, I usually looked for another site or moved forward or backward onto somewhat more level ground. As long as the coach is reasonably level you should be OK. I have seen folks with hydraulic leveling jacks lift their wheels completely off the ground. That is crazy stuff! We fortunately can't do that with air leveling.

At my house, I have a VERY sloped drive where I park the coach. I have to add 3" to the left front and 6" to the right front so I use a couple of 4'x2' pieces of marine grade plywood as the base then add the 2'x2' pieces to top of that. If I parked the car in front and the coach behind it, I wouldn't have a problem since the extreme slope is right beside the garage but then I would have to move the coach anytime I wanted to use the car.