Yaw, Pitch, Roll apps
I see there are several apps available for measuring yaw, pitch, roll & acceleration etc. Some cost a few $, some are free, some record the data.
and probably others.
It could be interesting to record the data and do before and after comparisons of any suspension or stability upgrades you do to your campervan.
I might map a route to drive first in my car then in my van to do a "ride" comparison of sorts using the data recorded by one of these apps. It'll have to wait until Spring though.