Old-Biscuit wrote:
Used one for 7 yrs. while FTng.
Get into a cg site and check level on pin box without even getting out of truck cab.
Shows which side is low and by how much.
Didn't care for the little additional level on it that was to be used for front to back.
Too small and doesn't stay in correct position.......
For front to back I use a 2' level on bottom edge of bedroom slide (before extending).

That's the one I have and it works great. When I'm in position I know how much out of level I am, or if I'm good to go. I have a level for front to back by the front stabilizer switch.
Like the man said though: you have to remember that it works opposite of a regular level.