Last year we bought a barely used (2000 miles) 2010 Four Winds (Thor) Windsport 32V. It is on a 2009 Ford F53 chassis. I'm not sure why the owners (original) only kept the unit for 5 months but - - -. Since it was a used coach the warranty from Thor was gone. The long and short of this is I needed some information on the unit and doing a few repairs myself (which I enjoy doing) so I contacted a representative at Thor. Now, they owed me nothing but a year and a half later when I have a question about the MH, I am able to contact the same individual and he has been super helpful in providing me information, documentation, parts manufacture contact info. etc. When I have needed a part such as a bathroom sink fixture (which I did replace), I have worked with their local dealer near the factory (Total Value RV) to order original parts so the coach has all original equipment etc. I call that service and support beyond the call. Of course I have had to pay for the parts etc., but everything I have done (and I'm kind of a perfectionist) is, if you will, OEM and very reasonably priced. Bottom line - when we upgrade next, I will consider THOR based on the support I have received on our used coach.
Be aware of one thing, in 2012 Thor made some fairly significant changes in how some models were equiped and manufactured so make your comparisons carefully. Your can go on their website and look at archived literature (specs., standard equpment and options) for all models of motorhomes going back many years.