It not just FR there is a reason for the coroplast on the bottom of new rigs from all makers. Saves a ton of labor not having to tie things up and makes for a great selling feature you know better gas milage and winter protection. Glad you found your problem and were able to fix it.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho