Bubble off centre does'nt tell you which 3 wheels to lift and by how much for each one!
There's level and then there's dead level.
Personally I hardly ever use CamperSet, I just think it's a great app if you want to vary your level.
You can achieve this very simply with the CamperSet app ( and the Truma app I think, after having a quick look ). You set your own level, whatever you want it to be, and then it will always get you back to that point.
I have actually done this on my NE148 board. The relays are soldered and failing to remove the relay I took a pair of pliers and disabled it, or to put it another way, I ripped the casing off and pulled the innards out! Make sure you get the correct relay though! I cannot remember how I figured...