Ahhh a subject I can help with. I had a the last camper i had was a Short Bed Pop Up on my 1/2 ton. It had a dry weight of 1200 / wet weight was about 1650. Palamino and 4 Wheel Camper both have 1/2 ton campers.
4 Wheel Campers - http://www.fourwheelcampers.com/
you can customize to your hearts content. have seen basic setups weighing less than 1000#.
Best of luck....