I would add to your list the Lance 845 and Lance 855 models. Your truck can handle the weight IF you add Supersprings to the rear.
Check your tires as well as if the stock ones are rated at 3200 lbs. each then the two at the rear drive can handle a maximum of 6400 lbs. less the 3,000 lb. weight of the truck leaving 3400 lbs. for the fully loaded camper - which is cutting it close. I switched out the stock tires for Nitto 285's rated at 3750 each. Toyo and BFG also make 17" tires with the higher load rating.
You may or may not need an anti-sway bar. Get the camper and verify before doing anything other than the Supersprings addition to the truck.
I spend $445 for the Supersprings and $500 for the new tires (sold the stock tires on my new truck on craigslist) to get the added load capacity for a Lance 845 camper on my 2500HD. I went with the 2500 as the 3500 is not available with an extended cab (now the double cab) and short bed configuration.
Don't go with air bags. They can break. They need adjustment and can have a negative effect on the truck's handling. Cost is the same as the Supersprings that need no adjustment and will never fail and do not wear out and cost far less to install (my set took less than an hour to install).
Lance is made in southern California. A good lightweight camper is the Wolf Creek which is manufactured in eastern Oregon and closer to your location so less shipping expense. They have a western Canada rep, Brad Clark (cell 250.549.8818).