Have not done this, but a spacer or just have 3” of truck bed exposed at the back. Assuming the camper doesn’t have a dropped back. If it does the spacer will work. Guessing you have not yet bought the camper. I would look at reviews and such, I have been around TC’s for 20+ years and IMHO would not buy a Palomino. Build quality has been lacking over the years. But they are a lower priced unit, and some folks lve them. Just look at it really carefully. A neighbor of mine bought one new and has had it back in the shop a number of times. (happens with new RV’s a lot). Just be careful.