Look for the most level area of the camp site (near the pedestal).
Eyeball it from back and side, determine the number of inches to raise the lower side, select correct number of yellow plastic leveling blocks, double check by eyeball, crank it up or down using eyeball, go inside look to see if wands on the shades hang vertical (might try the bathroom door thing),crank down stabilizers, done.
I used to use level bubbles but they were too small to be accurate, plus are they mounted right? I have found that it's how the trailer "feels" when walking around inside that is the best way to level.