If my rear bumper is level, every thing is also.
I place a 4' level on the bumper, place blocks on the low side to determine how many I will need, drive onto that number of blocks. With gravel or dirt, I error on the highside, assuming they will settle.
Can't do that with stick on levels.
I then place a 2' level on the tongue for front to back.
Little level in the fridge normally ends up somewhere in or near the circle.
I have those stick on levels, but I never trust them. Even though they tend to show level when I am done.
