Hi DanRuff93,
I'm sure there are some number of people using Mallard trailers or their counterparts on a full-time basis. However, you may find that some of the furniture and fixtures were selected based on the expectation of using the trailer for a couple of weeks of summer vacation and some weekend trips, which is what most people do. In other words, full-time use might cause accelerated wear and tear on cushions, chairs, and other items.
As for winter use, you might need to verify whether the Arctic Package is even available on Mallards. Alsio, recognize that the M32 comes with 20 lb. propane tanks, which will have to be frequently refilled as you use the furnace.
You should also check to see if the M32 has 50 amp electric service. In cold weather, in addition to running the furnace (which is necessary to heat the plumbing in the underbelly) you may want to also use ceramic disc electric heat. But if the trailer has 30 amp electric service, you'll find that possible, but challenging.
In general, as you move up the product line, you'll get insulation with higher R-values, which often relate to comfort in cold weather, and to how much propane you use.
If you will be camping in weather much below freezing, you'll find that heating pads on the holding tanks are pretty high priority. You might want to take a look at our owner-written
Water Systems Winter Usage Guide. It'll give you an idea of what's necessary to keep water running in sub-freezing weather.