Will a truck camper fit over the 5er rails in the truck bed?

I had a 2004 Ram before the Silverado. I loved that truck but when I changed 5er in 2011, it couldn't handle the job. The Silverado was the only one of the big 3 that was rated for the new load in 2011. To that end, it handles the load quite well.

I don't know what the camper will feel like, but the cargo trailer on its own is easy.

I'm surprised that you would equate difficulty hauling the big 5er with camper and cargo trailer.