I hope this will help. I've talked with two manufacturers. They say don't worry about grades while traveling and on L-P. Those are short in duration. But when you stop, be sure you are within a half bubble on your level, otherwise you can damage the unit. Almost all dual fuel models have an "auto" setting with default being "AC".
As for turning L-P on and off, most never touch that valve. Just fill and leave it alone. You aren't in a tunnel long enough for hardly anything to happen.
The most often issued warning is to frequently remove the outside cover and keep it clean around the gas burner and chimney. Birds like to build and just a little dry grass or other nesting material can start a fire there.
Also, if you don't feel you're getting the cooling results you deserve in the fridge section. The after-market 12v computer fans that a fellow is marketing, really do circulate the cold from the cooling fins to the whole box. I find it truly keeps everything much more evenly cool. Nice thing is it's cheap and so simple to install, my DW could do it. Who doesn't like simple.
2005 Winnebago Adventurer 35A
Toad 2010 Jeep Liberty / Blue Ox Aladdin