I recently purchased a 1991 Skamper 12ft pup, time to get off the ground and get in a bed, and with three kids and long trips it sure is nice to have something other than a tent! It didn't come with A/C but i bought a 13.5k BTU Carrier unit off eBay, good price and a respected seller. It's going to be here next week so i am getting ready for it's install. I'm a big DIY'er having remodeled and rewired most of my home so this seems simple but i have a few questions.. First of all is the roof, i see mention of roof supports needed on some models, but i can't find any info on this Skamper online. Will i need to add some kind of roof supports? If so how about just fabricating some out of steel box tubing and fastening them to the roof sides, its looks like they usually just cross on either side of the A/C unit and get bolted to the roof sides with "L" brackets? I have a metal and welding shop nearby that could easily cut whatever i need for a few bucks plus the cost of the metal, which from previous projects i know won't be too much, maybe $20-$30 to make a set. I just don't know if it will be necessary. My oldest son was on the roof helping me clean it after we bought it, i would imagine if it could support him it could support the A/C. Next is wiring, just looking for advice on what everyone else did. I already added an outlet on its own dedicated breaker to one wall of the camper where there is a pocket sewn into the canvas for the 12v wiring to hide in up to the ceiling. I was planning on just running the A/C power cord up that pocket to hide it down the wall and then use some peel and stick wire covering across the roof to the unit. The only question i have is what did you, the ones that have done this, use for a power cord? I can't find anything heavier than a 14awg appliance extension cord at my local hardware and home stores. I would like to find a 12awg cord but i haven't found any yet. I think the 14awg would be "ok" for the short run, only about 6-7ft over and down to the outlet, but i like overkill if possible, hence why my whole house is wired in 12-3 and even 10-3 for some of the outlets in my hobby room. Last but not least.. Is a cover for the unit when not in use absolutely necessary? I get mixed answers on this. Some say to leave it open so it can breath, some say if you put a cover on it when not using the camper it will just trap moisture and cause more problems. Thanks in advance!