Going out in cold temps

Thanks for all the advice already! The tanks and plumbing are in the enclosed belly (that's what you call a basement, I think, right?). But no, the "basement" isn't heated. I've read that you can put a small space heater down there for extra reassurance. Is that correct?

So here is what I'm thinking (my husband is the person who does all the maintenance, so bear with me if I don't use the correct language):

- Fill the fresh water tank the very last thing before we leave NH
- Put some RV antifreeze in the black and gray water tanks
- Make sure we've insulated any water pipes we can get to
- Have a space heater at the ready to warm the basement if we need to
- Make sure the propane tank is full and be prepared to need more propane
- Dump the tanks on the way home before we hit Northern temps
- Winterize again as soon as we are home (or maybe even before we get home)

Does that plan make sense?

Thanks!

- Michelle