Originally Posted by djlong150

Re:wear and tear on older units. Billybgame indicated you could put a strip of UHMW tape on the shell area where one half rubs againt the other to prevent black marks. Wat is UHMW tape and where might one purchase it. Thanks for your help. We are new owners of 2007 2720SL and tow with a2006 Ford 150 5.4 engine super cab.