Hi John, we have used a front cover for 2 years now, we originally bought the cover for our Hymer nova, which had an alluminium front, we got a few stone dents on it.
I ordered it from PROTEC covers, its made from the same material as their caravan covers, i put a piece of 10mm foam on the inside of the cover with double sided sticky tape, its held in place with 5 straps (each side) which slide into the awning rail, really easy to fit, worth its weight in gold, no more stone chips and a clean van when arriving on site!
I think it cost about