When we were shopping we came up with a similar list of specifications. We wanted bunks (for grandchildren) and a Murphy bed (for the living space). We wanted a fairly robust weight-carrying capacity, so we wanted double-axle. We were trying to keep overall weight down (because at the time we were towing with an SUV), so we DIDN'T want a slide. We wanted big enough tanks (fresh water as well as black and gray) so that we wouldn't have to be dumping or re-filling every three days or so.
We chose the unit in my sig (Flagstaff MicroLite 23 LB). It met all the criteria.
We've camped in it for two years now, and we still really like it. However, the trade-off between Murphy-bed convenience and storage is the weak link. Even though we can store quite a bit of stuff under the couch, it isn't as convenient as a pass-through storage area would be.
Still, you might want to take a look at one of these.
-Speak
