Melissa, as you saw from Frederick's measurements, the Compact Jr, and the Campster
tend to be considerably lighter than your popup. There are a bunch of similar trailers with similar weights, but these models of the lightweights seem to show up the most often on craigslist. Ours is outfitted with a 3-burner stove, 5 drawers full of pots, pans, cutlery, etc, a tiny sink, and gravity furnace
(they are notoriously heavy). The fridge
isn't installed yet, and we have no air conditioner, but I always carry at least 100 pounds of water, so the 1300 lbs our trailer weighs would be pretty close to what it would be if it was configured like yours -- no water but with small fridge
When your husband is along he can raise the top to accomodate his height, but when it's just you and the kids you will probably have enough headroom without raising the top. My wife is 5'2" and she can stand up straight and tall in ours with the top down.
I, on the other hand, far prefer the 6'4" interior height with the top up.
What may be a real problem for you is that there is just one bed. If everyone is happy sleeping in the same bed there is no problem. Oh yeah, that bed is wide -- 71" in ours.