Sagefemme
Senior Member
My cab looks just like Patrick's--Lev-O-Gage X 2, one for side to side on the dash, and one on the driver's side door for front to back.
My 2004 Ram has essentially no flat surfaces in the cab. I used an app on my phone called "Level My RV" to get the rig level before sticking on the Lev-O-Gages. The app allows an Apple device to be used as the sensor (put the phone on the surface in the camper you want level. I used the counter near the stove) and use another Apple device (iPhone, iPad, Apple watch) in the cab as the display. See screen shot below.

When I'm with my spouse one of us gets out and puts their phone in the camper while the other person makes adjustments to the rig, watching their phone or in my case my Apple watch. When I'm by myself I don't want to get out to place the phone in the camper first so I just use the Lev-O-Gages.
What I really wish is that I could turn off the part of my brain that is laser-focused on out-of-level situations. My spouse cares much less.