The Canadian inspectors are only going to be able to go by the gross rear weight rating for your truck and the weight indicated on the sticker on the back of the camper. My 845 has a sticker weight of 2400 lbs. and an actual dry weight of 3000 lbs.
Something to look at is the size of the fridge and the size of the holding tanks. The Lance 865 that was mentioned has a 3 cu ft. fridge whereas the other Lance short bed campers have a 5 cu ft. fridge. The 865 has roughly half the gray and black water holding capacity of a 855 which means more stops at dump stations.
There are lightweight hard side campers that do not cost you in storage space the way popup ones will. Start with a target dry weight and that will make for a short list to evaluate.
I don't know about trucks sold in Canada but in the USA the truck's payload rating will change based on the rims and tires that are put on the truck at the factory with everything else the same.
Suggest you go to local campgrounds and talk to the truck campers you find and see what they are driving and if they have any problems. Then you can have a better perspective as to how real the risk. In the USA we have a tendency to be extremely paranoid as you probably already know.