mccrlc,
Has your van got the standard length tow a fram? I have a stone guard very similar to yours I made for our Swan Outback and now am going to change the mountings to suite our Discovery Outback to fit and would like to know how clearances appear to the tow vehicle, ours has a jerry can holder about where your gas bottles are. We also tow with a PB Challenger.
regards
Jimsiron