Another thing you might consider Zaine...
How cold does it usually get in your area and do you really want to put up your MH for the winter season or do you plan on going out on weekends?
Where do you store your MH? At your house? Do you have 30/50AMP Shore power there (or at least 110V?)
We live in the south so freezing is not too big a issue (although we have had a couple of cold nights!) We also like to go out for a weekend getaway during the winter months so here is what we do (YMMV
We had a electrician come in and install a 50AMP recepticle near our RV pad (this way we can run everything in the unit - which includes a nice fireplace
we keep our tank heaters on (believe this will translate to your arctic pack)
we have a space heater we keep on in the unit - it has a "Anti-freeze" feature: if the air temp drops below 45 deg, the unit will come on until ambiant temps are 50 deg - this keeps the upper pipes from any freezing danger.
When we are ready to go out, we disconnect, slides in, and off we go! If we camp in a area that is colder (like going to the mountains for the weekend) we leave the space heater on when we go out for the day - saves out propane and uses the park electricity >;-)