Hi,
The 3500 when running on gasoline could start and run both the air conditioner and the fridge. On propane, (which for me is hard to come by) I doubt that both could be started. I'd advise you to do gas, and remote electric start.
If you need the roof air it may be better to find an inexpensive campground at the link below--or similar searches:
https://freecampsites.net/WrightOn wrote:
Thank you for the responses. I've looked at the Champion 3500 dual fuel and like it thus far. In my reading, many state that the 15k AC unit can be run with lights. No one has indicated that the AC and refrigerator can run at the same time (I have a commercial home fridge). That got me thinking, can I run the AC via the generator and run the refrigerator off the inverter like I do when traveling?