I would definitely get one.
This is the one I have:
http://www.carid.com/2007-chevy-silverado-truck-bed-accessories/dee-zee-bed-mat-15749207.html?gclid=COePsoz-kcQCFReTfgodxU4AIw
I have had them on two different trucks, under two different FWC campers for 30 some years and well over 100,000...