We have a Passport 238MLWE that we bought in 2011 (2 adults, 2 young kids), it has the features you are looking for, mainly that it's light, it has bunks and a queen, and is available in the NW. We tow it with a Tahoe, and have put about 25,000 miles on it and lots of nights. It works well for us with a couple of minor upgrades- mainly better mattresses and 6 volt golf cart batteries. We're planning to upgrade to a 5th wheel bunkhouse soon, as we're getting a big dog and we camp mostly in the winter/rain. My gross weight with it fully loaded is 4200 lbs, including water in the tank.
It's light because it uses a sandwich of foam and thin plywood for the walls and floor (no studs or joists except for the perimeter frame and where the doors and windows mount), no underbelly insulation, single pane windows, small tanks, no slide. We've camped in cold weather with it and use it for a guest house in our driveway, and as long as the weather is above about 25 degrees it stays comfortable enough. Below that and the plumbing will freeze up and the furnace can't keep up. I extended an extra furnace duct/vent into the bathroom and that helps with the comfort level.
