This is our first winter in our new RV (2007 Keystone VR1). I live in Central Texas where we generally have mild winters; but do have our occassional 25-30 degree days once ina blue moon. My question is what do I have to do to ensure I have no problems with my RV if it sits 2-3 months of winter and has no use. Am I safe with just draining all the holding tanks with the pump, or do I need to have a dealer winterize it? I'm just new and confused and want to protect my investment.