I have a 2001 Mirada. Most of your Fresh water plumbing is internal and should be OK with minor excursions below freezing, as long as the heat is turned on inside the MH.
The black and gray are external, and might be OK if the temp doesn't get below about 30 for more than a couple hours and there is no winds. (It should be OK while traveling as the engine heat will keep the tanks from freezing)
When we travel in freezing temps we flush the toilet with Windshield washer fluid (make sure its the below freezing kind) or RV antifreeze. Try and limit the toilet to #1 usage.
Same with the gray water, limit its use, try not to use the drains to much, if so, dump some RV anti freeze or Windshield washer fluid into the drains.
Do NOT leave windshield washer fluid in the tanks over the winter or use it to winterize, use RV antifreeze. I watch the sales and usually when I see RV antifreeze on sale for $2.50 a gallon, I pick up a few gallons. Same with windshield fluid, $1 a gallon. I carry 5-6 gallons in the RV and use it to flush and also re-winterize.
We head south for a few weeks in the winter, and then when we come home (northern Ohio) we re-winterize somewhere on the road or the last campground before hitting the below freezing temps.
Since my memory is short, I wrote up a winterization process for my Mirada. You can see it here.
WINTERIZING / DEWINTERIZING | 2001 Coachmen Mirada 300QB