First of all, consider where you will be staying for a time before buying a tow vehicle and actually traveling with the RV. I'm not sure the Tradition has the same insurance package that the Elite and Mobile Suites models have. We have a 2010 Mobile Suites and have been comfortable in temperatures ranging from up to 115 degrees and down to -6 degrees. The one issue we have had is that at about 0 degrees, the hot water line from the water manifold to the kitchen sink freezes up. It is only the hot water line, and we've never detected a leak, so I'm presuming that the PEX lines are why they don't.
As for structural problems, I've not heard of a lot of problems there, but then, mostly what are discussed here and at SOITC are for the Elite and Mobile Suite models and not the Tradition. Incidentally, while SOITC's website is operational, the search function there is not picking up posts that were made prior to the forum software upgrade. Their website:
SOITC (Suites Owners International Travel Club)
And Joe is right in that problems occur all across the RV spectrum of brands. Keep in mind that forums tend to attract people who are looking for the solution to a problem, so it tends to look like "brand x" has a lot of problems. However, the number of participants on the forums are very minimal compared to the number of owners of that (or any other) brand.
If you'd consider a used Mobile Suites (better insulation and frame), check out Rolling Retreats. They generally have a selection of good used ones and Joe is right that they have a good reputation for their PDI.
Rolling Retreats
Terry