What model of 5TH wheel do you have? Do you have the 6 point auto level on your trailer?
I do not have any leveling device on my hitch or trailer since I have the 6 point level up system. This levels the trailer within 1/10 of an inch. I do check the fridge to make sure it is level with a torpedo level.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 135K+miles