My 10' CO weighs (data plate ) under 2000 lbs.... a little heavy, but not horribly so. After all, it is 10 feet long with cabinets/cupboards/drawers/potty/sink/etc.... plus cab over bed!
One feature I like is the furnace thermostat is reachable on our narrow dinette model from the CO bed, so we depend on only blankets at night, but it comes up to temp fast while still in those blankets when going to get up to dress. Insulation is good on the top part, and since heat rises, it works well.
I bought mine used, and was lucky enough to stumble on one with the narrow dinette. Not fo everyone, I know, but with just the two of us it works, and the lost dinette area becomes storage, which suits us a lot better than tight room for four at a table.
Also recommend to get the slightly wider CO bed. A skinny couple might do fine with the std bed, but we are not skinny anymore, so recommend the bit wider CO bed.
I will post more about my Alaskan later....