Picking the right camper for my 1500 series GMC pickup...

My truck was a 2002 Chevy Silverado WT Extended Cab, 6'6"bed, 4x4, 5.3L, Automatic Trans,with tow/haul package. Truck was factory stock, no modifications. On it I had a '97 SunLite Eagle popup. Never had any problems, but as somebody noted, I usually drove alone which gave me 750 more lbs of passenger weight to play with.