I bought a new truck camper back in 2019. Knew nothing about truck campers. I did research the payload of the bed of my 2500 HD Dodge Ram crew cab, long bed. I found a truck camper that came in about 800# less than the payload, which was great. Allowed for "some" stuff. Turned out it was a perfect match with air bags installed. No sway. So, I would suggest researching the payload of your truck bed and go from there. I would think pulling the 5000# trailer, IMO, would be OK.
I agree with HappyCamper...2x4's in truck bed should allow for the rails.
