Builders beware -
I followed VANs recommendations for clearance between the main wheels and the wheel pants to the letter and still ended up with a 2"x2" inch section cracked out of the inboard rear corner from obvious tire contact. It cannot be seen without getting on your knees and was easily repaired. I've subsequently increased the gap by an additional 3/16" along the rear section you might consider the same.
I followed VANs recommendations for clearance between the main wheels and the wheel pants to the letter and still ended up with a 2"x2" inch section cracked out of the inboard rear corner from obvious tire contact. It cannot be seen without getting on your knees and was easily repaired. I've subsequently increased the gap by an additional 3/16" along the rear section you might consider the same.