We used to have a pop-up with square wheel wells notorious for capturing blowout pieces. I was going to cut up a 55 gal. plastic barrel and make wheel well liners for it, but we sold it before I got to it. Don't know if you could use that in your application, but it would certainly be light weight.
Family of six, camping in a Grey Wolf 26DBH LTD pushing a 2010 Armada via 10k/1k HaulMaster WDH stopped by a Prodigy P2 brake controller
Tug: 2010 2wd Nissan Armada Titanium with tow package.
Specs: Max Trailer Weight 9,100, Tongue Load: 910, GCWR: 15,100, GVWR: 7,150, Payload: 1,592