Minimally I would put a cup of RV antifreeze in each of the sink drains and shower drain. Drain the hot water heater and open all of the low point drains. If it were me, I would also put the pink stuff in the waterlines as well. If power should go out and it freezes, you could end up with an undesirable leak/repair.
You need to provide adequate information for an intelligent response. How are you planning to heat your MH? What average temperatures are you expecting? Are you aware the "heated tanks" are usually only heated when you run the RV furnace? Are you planning to drain the fresh water system and holding tanks, or do you plan to maintain your MH fully-loaded, ready to drive away on a trip? Do you have 120VAC available to re-charge the house and coach batteries?
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, Jess
, and our Parsons Russell Terrier, 
