Choosing between trailers

You said it yourself - so-called 4 season trailers ... so the sooner you get this idea out of your head the better, especially for use here in Canada where winter temps can be quite extreme. Regardless of manufacturer claims these are all recreational vehicles designed for intermittent recreational use, not full time living. Sure, some may be somewhat better equipped for cooler weather use but full time traveling in the dead of winter? - hardly. At best you'd want to park it once temps really fall and at the very least skirt it, adding an underfloor heat source as well.