We have had our 3950 for a year now and have been all over Oregon, Idaho, and are currently in Tucson for our second winter. The 3950 is a fair weather trl not being as well insulated for cold weather. It does OK but it takes a little more propane or electricity (we use two small elec heaters) to heat it. In non freezing weather we put one elec htr in the bedroom and shut the door.
I carry two dirtbikes, one streetbike, and a couple of bycycles. When we get to where we are going I unload them and use the garage for storage, a second bedroom, an office, and a laundry room. The w/d combination is good for small loads. The extra half bath is ever so handy.
We really like the 3950 and it suits us well now. When I grow up (61) we will probably go to non garage model for a little more living room.
I pull with a 3/4 ton chev duramax and it does well but a dually would be more stabled and safer in case of a blowout.
We have had very little problems with the trl other than the normal little things that need attention like any other. The factory and purchasing dealer have been good to work with, other dealers, NO.