Why a class A gas over class C?

Just a point or two. Class C's are metal, class A's are fiberglas. In an accident, metal transfers the impact, where as fiberglas absorbs the impact. Yes there will be more damage to fiberglas at lower speeds, but I personally like the absorbing effect of fiberglas. You want to boondocks for many days, you need larger holding tanks. My Phaeton carries 100 gallons of fresh water, 50 gallons of black and 70 gallons of grey. As far as the windshield killing occupants, total BS. I hit a wild turkey with the passenger side windshield, doing 55 MPH. The windshield caved in about 5 inches, but did NOT fall out. I will vote for a diesel class A, I believe you will be much happier.