I pull a Keystone Hideout 175lhs, which is 3300lbs empty, and about 4100lbs full. When I did my calculations, this only left me about 600lbs for passengers, so forget about filling up all the seats, too. I am hampered a little by the diesel engine which adds 400lbs in weight, which comes directly off of load capacity. On our trip from Oregon to Montana this summer, there were quite a few times that I wish I had more power, though it was usually workable, and always much better than it would have been in my Sprinter. One takeaway I got from the trip was the lesson of aerodynamic load - I would strongly consider getting a 7' wide trailer over an 8' wide one, even if it is longer, as it will be much easier to pull at highway speeds. On one stretch we went almost 3hrs into a 35mph headwind, and the van would barely do 60 on level ground, downshifted, and was getting 8.9mpg, which is the worst mileage I've ever gotten in a diesel. In my dreams, my next trailer is a Livin' Lite
