Hi Carl,
If this camper is staying on full time, like my Ranger that has never came off, then consider taking the truck to a spring shop. There they can add a leaf one on either side of the load leaf and re-arch the springs to level off the ride.
If you do this and find you don't have the camper on anymore, then your ride will be like a buck board. You will be looking for weight to add.
I guess you could add the helper springs to see if you have the lift. Never liked those because they put pressure only on part of the spring and over time springs could break.
If only put the camper on for few trips during the year then I would suggest air bags. The bags will lift from the top of leaf springs and the frame, and push them apart. That is how you get the lift.
Does this help?