182G New A/C Install

Ours factory installed A/C is so noisy we rarely use it.  I'm always on the look out for something better.

If I do go the the roof mounted route I'm going with Coleman 9K BTU low profile.  Found the top and non ducted underpiece for under $700 total plus shipping. My R-pod is prewired up to the skylight with it's own dedicated 20 amp circuit, so connection should be simple.  Still debating as to trying a small portable and venting the drain pipe outside through the window above the kitchen sink.  Anybody trie this and have any suggestions for a portable?  Preferably something not to large, I think 5,000 BTUs would be more than enough, my rig is only about 85 sq feet from front to back.

I kinda feel the opposite, I wouldn't want to take the risk of buggering up a new trailer. And I haven't bought a new vehicle or trailer in - uh, well, I can't remember that far back. Besides, I'm a cheap old guy, I keep my stuff pretty much forever, as long as its still working anyhow. 

They make flush mounted cassette evaporators for installation in ceiling cavities that you would need to build a cover for where it came up through the roof, they're about 10 inches tall but much smaller than a roof a/c.  But the condensers are all for ground or wall mounting. Some folks have mounted them on the rear bumper. The refrigerant lines would have to lead up the outside wall which might be pretty funky. Placing the condenser above the evaporator creates some problems with oil migration that have to be worked out. 

No need to cut into the frame with a mini split other than a 3 or so inch hole for the refrigerant tubing. The interior evaporator unit hangs on the wall. It only weighs about 20 lbs so screwing a aluminum plate into the wall framing (which is 1x1 aluminum tubing) and then attaching the evaporator to the plate should work. The condenser can mount on the tongue where the batteries are. On my 179 I would have to move my propane tank forward slightly and bolt or weld on brackets to mount the condenser on. I would need a cover for the condenser to avoid damage from road debris while towing. The batteries would need to be relocated to the interior of the trailer, I would change them for lithium ones at that point. Then I would need to route the two refrigerant lines, a condensate drip line, and a power line from the condenser to the evaporator. All that is bundled together in about a 3 inch diameter circle, which would be routed out at the front bottom of the trailer. The units some precharged so in theory you don't need am a/c tech to pull a vacuum on the lines when installing. They make a cover for the tubing which would be visible inside the trailer until it dived through the corner of the bed into the area where the water heater is under the mattress.