Our Greyhawk did not have a leveling system or stabilizers. Most sites we camped at were relatively level and just required some tweaking. We had 2 sets of Lynx leveling blocks and a handful of 1" and 1/2" thick pieces of plywood for additional tweaking.
We tried to always keep the rear tires on the ground since they require more blocks under them. Only once did we not have enough blocks to get very level, but we were level enough. That site was meant for a smaller RV with a steep driveway to get to the mostly level portion of the site.
Our Class C had 2 slides, one on the street side (front of RV) and the other on the curb side (rear of the RV). The curb side slide had bunks in it. Our camper rocked every time one of the kids moved in a bunk. We purchased a set of
stack jacks from Camco. I put them one the house, not on the frame. Up front, one was placed at the corner, just behind the cab. On the rear, they were place where the house began to turn up, behind the rear wheels. This helped to remove the rock out of the camper when the kids shifted on the bunk or someone stepped into the camper.
If your Motorhome doesn't have slides, you probably won't have as much rock as we did. Our current TT has 4 slides, 2 opposing slides have bunks. Even with wheels off the ground, we get a little rock if one of the kids jump on the bunk or are horsing around on a bunk.
-Michael