winter camping with trailmanor

We are about to be new owners of a trailmanor.  We have some land up in central vermont and we would like to do some winter camping with the unit.   We talked to the dealer about this and he said as long as we stay above freezing we'll be ok.  He also said we could insulate the grey/black water tanks and put heating elements on them for this.  Has anyone done this?  If so how hard is it, and does it work.  Are there any major draw backs to winter camping with a trailmanor?