If you mean for the bedroom you will need a low profile unit. 13K will be more than enough for that area. I have an older Coleman I installed as it was a take off from my old 5th wheel.
On that trailer I installed a Mach 8 which was true to the reviews and sounded like a Cessena was on the roof while operating. Was annoying for me and the neighbors.
I fished wires on the Montana from the new A/C to a thermostat on the wall by the first one. Was a waste of time and I should have just used controls on the inside diffuser instead.
2011 2955RL Reese Sidewinder 5th Airborne
2014 RAM 2500 CD Demco Recon Hitch
4X4 Crew Cab/Short Bed