We usually travel between TX 800, FL 0 and CO +7000 every summer.
I change the altitude at least 3 times a year.
I found the oil level the most critical thing to monitor on our last mh. Let the oil get 1/2 to the add mark and we would have shut downs while driving on rough (aren't they all) roads.
Didn't have that problem this year
no point in running the generator.