I have looked all over and I know that Champion doesn't offer an auxiliary gas tank. Anyone fit one or know of an installer who fit an aux tank on a Champion conversion? I am talk at least 4 gallons and 5 or more would be better and have the thing integrated where it fed the main tank or there was a cut over switch w/fuel pump to access the extra gas like on a Roadsmith. I don't want to stick the aux tank in the trunk, by the way... has to be under-body somewhere.