I sprayed 3 coats of the rocker panel guard material on the front of my trailer last year before heading up past the Arctic Circle. After many miles on gravel roads I found it didn't help much at all. In fact the rocks punched a hole right through the
fiberglass on one front side. Part of the reason was the difference in height between my trailer and the truck. I have an 8" drop hitch, good rubber mudflaps on the truck but not long enough to prevent rocks spraying back.
After some online investigation I ordered a set of Monstaliner sample chips in the colours I thought would go with my trailer. They were free and came via regular mail even though I live in Canada.
Their website has lots of information on the application process - it's a roll-on material. It's very thick and looks indestructible. Expensive, yes, but you don't need much just to do the front of your trailer.
There are good reviews on the web about this material that convinced me this is the way to go. As soon as I get the
fiberglass repaired and the remaining old rocker panel guard material removed I will be applying the Monstaliner.
Also going to extend my mudflaps on the 4 x 4 truck!
Anyone else used this material for their trailer?