I doubt the AC will run on the single pole 30 anyway. You usually need the 240/50a connected for that.
Cooking is generally propane except for a microwave. You are left with a mini fridge, lights and the TV on most small RVs.
There are land yachts that barely get by on the 240/50.

I think this one has 2.

http://gfretwell.com/ftp/Bobs%20RV.jpg


Greg Fretwell