I think some kind of cover is a good idea if for nothing other than stopping sun fade. I keep our fifth wheel covered with a soft cover as we use it less often, but putting a soft cover off and on our TC would be a pain as we use it frequently so I am building a small metal roofed shelter for it. I think anything you do to keep a truck camper covered will help preserve its value.
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC