Search for J skirt for the metal & Icon Technologies for the fenders. I did one on my last 5W took a couple hours. I pounded the damaged fender flat for a template. On mine there were some hidden screws under the trim strip. I was able to carefully open it to get to the screws and bent it back when done. That was a Jayco but they are all similar. CW wanted $1300 and a day. Long story short that went down hill and I ordered all the parts needed for $250 + $250 shipping. The J panel was 10 or 12ft and I had them cut and ship to save over size shipping. I think I could do it in an hour now. Good luck.
2015 F350 FX4 SRW 6.7 Crew, longbed - 2017 Durango Gold 353RKT
2006 F350 SRW 6.0 crew longbed sold
2000 F250 SRW 7.3 extended longbed airbags sold
2001 Western Star 4900EX sold
Jayco Eagle 30.5BHLT sold, Layton 24.5LT sold