Originally Posted by bikendan
I wouldn't go over 3000 lbs dry weight.
You'll end up around 4000 lbs loaded for camping, which will be at the limits of your Nissan, when you factor in the air resistance of the trailer's frontal area.
IMO, that's a pretty conservative figure. Your max payload is only 1100, so with 3 passengers, a full tank of gas, hitch, pin weight of 400 pounds (estimated on 4000 fully loaded trailer), and no other cargo whatsoever, you're at max. Add in any additional cargo and your available pin weight will have to drop.
I would say you're looking more at around 2500 lbs dry... allowing 1500 pounds of necessities (battery, propane tanks, water, hoses, etc etc) and personal gear (food, dishes, clothing, bedding/linens, tools, toys, etc etc)
I don't think a travel trailer is in the cards, but you might get away with upgrading your popup. There are some flagstaff's that might fit the bill.