I don't think you need a 30 amp circuit unless you want to run everything at once.
Without the A/C a 15 amp circuit is fine. Borderline with A/C on.
My house has an outside 20amp outlet and the A/C works fine . (use adapter plug).
I can run anything - except I won't run A/C, Microwave, Fridge, and electric WaterHeater at the same time.
Just like you can run everything at once in your house , the TM is wired 30amp to run it all. (Microwave may be option)
I can't find specs for your RVP model 2202-876
Many Coleman/RVP specs are listed here:
http://www.coastdistribution.com/PDF...uct%20Page.pdf
.... (Caution: the specs may differ some of our older units.)
Page 4 shows my Coleman RVP MACH 3+ 8333:
14.5 amps for cooling. Ranging from 1595 to 1924 watts. (see fine print for testing conditions).
Other units listed have a variety of requirements 12.6, 14.3,14.5, 9.3, 10.2, 12.7, 9.0 amps.
For testing all your 120v devices the Kill-A-Watt meters are really cheap now. Home Depots are selling them.
To reduce load while using the A/C you may want to have batteries charged or disconnected first to disable charging.