Thank you for the answers, this helps alot. I am comfortable using my axle and tire ratings to understand what is possible. This is basically what the salesman is telling me but I feel sales are more their business, not vehicle engineering.
The Cirrus 820 is their short box camper and the 920 is the long box camper.
We do travel light and do not have a lot of gear in the camper, but still I think loaded I'd be 3500-4000 lbs for the Cirrus. We do spend a lot of time in deep snow and off pavement on forest service roads. Our current hard side 1978 camper weighs 800 lbs!
So with my 6200lb rear axle I'd probably be ok, but pushing it if I also wanted to tow my small trailer (tongue weight ~650-800lbs).
Tires are 265/70R17E 2731 lbs. So does that mean for the pair of rear tires I have 5462 lbs of capacity? Well under what the axle can handle... what a flaw of initial design...
Having to add a hellwig rear sway and/or air bags and the superhitch is one of the reasons I'm looking at smaller campers. All those truck upgrades are expensive.
I wish I could find a cirrus 720 near me. Closest one is an 18 hour drive away. Truck camper shopping is so depressing. Not just because of the weight but because they are all so ugly and lack any modern innovations (except cirrus). Plus they all come with options I do not want. Microwave, AC, TV. If I see one more beige/pink faux sponge finish vinyl wall or yellow or cherry cabinets....
Any camper that actually makes sense for us is a custom build with a 6-9 month wait time. :sigh:
My new top runner is the Northstar liberty. I will have to paint over the sponge bob vinyl and buy a new heater right out of the gate I guess, but it's that or wait 8 months then drive 22 hours to pick up camper. Already I have to drive 7 hours to find a northstar dealer.
Appreciate the info!!