What you have is a StableLift. They are quite expensive and work very well. When you raise lower the camper onto the truck, you keep retracting the lift and it "hugs" your truck to keep the camper and truck connected without using tie-downs. There is a cradle that attaches to your frame to catch the lift when it retracts. It is a simple system and can be made for your truck. If you search for Stable Lift in the forums you will probably find at least one thread where someone made their own cradle/receiver. I'd search for you but it doesn't work right on my iPad.
That looks like a larger camper so it will be in the 3,000 lb range when loaded. You can keep the weight down by not carrying full water and waste tanks unless you need to, and by being aware of what you put inside. It is not hard to add 1,000 lbs to one of these. Make sure your tires are up to the task by checking the weight ratings. You will want a Load Range D or even better an E rated tire.
Good luck and have fun. I think you will like the Stable Lift.
-2000 Chevy K3500 CC DRW 7.4L, Auto; 2000 Arctic Fox 1150 WB; 1999 Bayliner Capri 1800LS Outboard
-Air Lift bags, Torklift tie-downs, Superhitch w/48", Rancho RS9000X, K&N FIPK, MagnaFlow exhaust.