The carrying capacity weight and dimentional wise is way too little to carry a TC that you could do little more than turn around in. Many are at max with only 1000 lbs in their bed that's less than a 3' high load. The small pickups you refenced do not do well with a high load in their bed as their wheel to wheel (L to R) distance is quite narrow and they become tippy quickly. Many who have owned the small Toyota class "C" etc that was offered years ago made very derogatory comments on the forums as to the handling on the road at 50 plus MPH and remember that they had dually wheels in the rear unlike the small pickups.
Perhaps, a small light popup TC may make more sense but they have their limitations as the how cold the temps are and where they are allowed due to aggressive large food seeking animals. Food for thought, haha, like don't feed the bears!
A superb CC LB 4X4, GM HD Diesel, airbags, Rancho's, lots more
Lance Legend TC 11' 4", loaded including 3400 PP generator and my deluxe 2' X 7' rear porch
29 ft Carriage Carri-lite 5'er - a specially built gem
A like new '07 Sunline Solaris 26' TT
Also Phoenix, Northstar, and Hallmark. I'd double check the weights more than twice on all of them though. The sizes work but the weights are kinda borderline.
My Four Wheel Camper's sticker says 760 lbs and it is probably the lightest of the afore mentioned brands. At the scales with a few options (frig, dual batteries, furnace) it came in at 1,300 lbs dry and empty. Loaded and wet well over a ton.
My choice is a 3/4 ton truck. Go into this with your eyes wide open.
Just the two passengers will weigh in at close to 350 ~ 400 LBS ! Then, as the poster above mentions, add 170 ~ 200 LBS of water (and that's not much water!), you're up to close to 550 ~ 600 LBS payload, then, your sub half-ton is cooked. Its nearly at absolutely max capacity without adding a family tent and kitchen tent (add those tents, and you'll be at 700 LBS or more; add a truck camper not made from titanium and Spectra skin, and you'll be 400~500 LBS over).
I agree with Travelnutz: forget any sub half ton truck, if not for the very precarious high-elevation load dynamic, for your potential driving anxiety (sanity) with overload on such a narrow frame attachment spread.
If at all possible, and you are on a very tight budget, consider a used half-ton pick-up (there are lots in the $5500 ~ $8000 range out there now), then go for a small ultra-light camper.