I run my generator and roof AC when the weather is exceptionally hot, or going up steep grades. The roof AC keeps the coach cooler and the generator uses less gas than the dash AC. As stated before there are times I'll run both if the sun is hitting the windshield. I usually pull over with the big rigs to keep from holding up traffic and downshift. I'm never in a big hurry to get anywhere and am towing a Jeep Wrangler to boot. Being retired is a good thing.
'97 Pace Arrow Vision 36 with Tag Axel, Ford 460 with Banks Power Pack. 2000 Jeep Wrangler Toad, one miniature schnauzer that rules the roost and a wife that enjoys traveling. Retired FTCS (SS) USN and loving it. FMCA#461483