Basically the above pic.

Got visit coming and we like to let people stay in the RV if they like for a bit of privacy. The problem is that the air conditioning in the RV pops the 15A circuit in the car port, which makes sense; RV outlets for trailers are all 30A 120V.

Turns out it's pretty easy to install a 30A line. At each end, the appropriate single-pole 30A breaker (which in my case is Square D) and a NEMA TT30 "RV" type plug. If you've been to an RV park, you'll have seen one. And of course an appropriate electrical box.

The very important part is to use the correct guage cable. This calculator shows that a run of 35 ft should be carried by 10AWG wires. 10-2 (10AWG, 2 wire) cable is a bit pricey, but not feeling electrical cables getting really warm under load is nice too.

Anyhow that's it. One less thang.