I have a stick on that shows "inchs out of level" glued to the driver side front off near the landing gear up down switch.
I back/pull into the spot where I intend to park it and get out and look at the bubble. It will let me know how many and what size 2x12x12PT boards (I also have 1x6x12s PT - 2 per tire) to put under the low tires.
I pull forward; slide the correct number of boards between the tires and behind the trailing tire; and back up on them.
Recheck level; it should be right in the center; and put the X-Chock in both sides.
Proceed with disconnect and level fore and aft with the landing gear. I use a 12 inch level on the floor of the camper to check. Since I lift the back slightly with the rear stabilizers I allow for that with the landing gear.
If it ever turns out that I did not allow enough, you must remember to retract the rear stabilizers some before raising the front landing gear. Failure to do so will result in damage to the rear stabilizers.
(Don't ask how I know).
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW