I think the new AR-ONEs have an 8000K a/c now. If not, I'd pass; we have the 5K and it barely keeps up in GA/FL summer camping weather. We have the 14RB, which we got b/c the price was right (end of model year clearance), and I can tow it easily with my 2010 Pathfinder. The tanks are tiny (9 gal. black/15 gal. gray), so you'll need a tote to take along to empty them frequently, if you don't have full hookups.
In our camper, there's no exhaust fan in the bathroom, only a vent. There's no electical up there either, so if you wanted to add one, it would be kind of a big deal to add it. We camp in warm/hot weather, so it's a pain. The bathroom gets hot and steamy fast - we leave the door open when showering to help.
We can't seem to keep the smoke alarm from going off whenever the furnace kicks on in cold weather. We've replaced the smoke detector, replaced the batteries, let the furnace run to try and get the chemical smell to dissapate, but it still does it - always in the middle of the night, of course... We've had to take the batteries out when we use the furnace, which is not safe. Our furnace is not right under the smoke detector, so we can't figure what the problem is, other than the camper is so small that the heat rises quickly and sets it off.
We had to have the frame for the couch and the bed reinforced b/c they were shoddily built and the corners were pulling apart after only one or two uses (my husband and I are not big people either). The dealer was great, and rebuilt and reinforced the couch frame for us, and reinforced the bed frame, which wasn't in as bad a shape. It's fine now.
The camper is okay for our needs, but if I had a choice and the money, I'd go with a different one - JMHO. I'm glad we have a two year warranty!