Max Leveling Angle

A few inches difference front to rear is about it. Depending on the system used, some hydraulic levelers can lift the tires completely. Some will say that's unsafe. I don't mind lifting front tires myself.

Lifting a back tire means your parking brakes are no longer touching ground, not good, especially on a slope.

Yea I'm afraid I can't offer any exact info either. IMO motorhomes are not designed for huge corrections in leveling. Level or near level is best and then the jacks should only be used to make minor corrections. Extremely unlevel also puts the entry door unusually high which we hate.

Some of that depends on the chassis. Ours is a Workhorse W22, 22.5 rims, so it sits higher off the ground than some other chassis do. In some cases I have to add wood blocks under the jacks. Then you run the risk of lifting the tires off the ground which isn't the best idea, especially the rear tires. I have lifted the tires off the ground, placed blocks off under them then lowered the MH down until the tires are hitting again.

That's not typical, most RV campsites aren't that out of level. Driveways, well they vary a lot.

I have constructed 10" x 10" x 4" pads out plywood and 4-2x3s which I use as leveler pads to broaden the leveler feet so they don't sink in the ground. In the driveway I double up on the front pads to not have to extend the arms as much. I have constructed a taller one for the tongue lift just for the driveway drop.