I always take our RT out at least once every few weeks year 'round. The vechicle part of your RV needs exercise as well as the generator.
I run the AC off the generator going down the road all the time. In the winter, our Roadtrek AC is a heatpump and I run it full blast on heat for that hourly exercise. You save nothing by NOT using that generator ...........you spend a lot of dough on repairs as you discovered.
Being a bit old fashioned (although mechanics tell me it is no longer necessary) I also run the dash air on all my vehicles every now and then in the winter. By the way, we can cool our RT210 solely with the dash air going down the road regardless of the temp and we live in an area that frequently exceeds 100F in the summer. I have never fully understood why folks must run their coach AC to cool it down but I know many do that very thing.
PSW
2013 Phoenix Cruiser 2350
2014 Jeep Cherokee behind it
and a 2007 Roadtrek 210P for touring