1999 Gulfstream Friendship 8405

[milagrobay]

I just purchased this beauty and I am trying to get information about using this during the winter months. I hope that there are other owners that use theirs during the winter months. I do not have an owners manual for this coach and therefore I am trying to learn as much as possible about preventing water system problems during winter travel.
??
1. Does the furnace heat the main water tank through the lower storage bay?
2. Does the furnace also heat the grey and black water tanks?
3. When driving in below freezing temps any tricks I need to know about keep the water lines from freezing?