Recently acquired a 2000 Winn Journey 36G on a Freightliner chassis. On trip to Florida last week I noticed when I got there the hot water was piping hot - I did not have the propane on and the electric hot water switch was off. I had read in the manual that some rigs had a way of using the diesel radiator to heat the water in the house hot water tank while moving down the road...but then it said this was not an option in the freightliner chassis??? Anyone else have this setup? And IF i have that option, can the tank be damaged if you drive down the road with the hot water tank empty? Thanks