Biodiesel is one heck of a solvent. If your coach is a bit older or has never used biodiesel, don't be surprised if you experience some plugged fuel filters until the tank and fuel lines are cleaned. FWIW: I have a Ford Powerstroke Diesel that never used biodiesel until I had it six or seven years. I was concerned about the tank and lines getting cleaned and plugging the fuel filter but never had any problems with it.
'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
Blue Ox, Aventa
US Gear UBS