they are one of the best built trailers around imho. they do weigh more then the comparable sized superlights that are out now, but there is no question which will last longer if you compare both side by side.
I don't think you will have any issue using that trailer year round. I have friends who own a desert fox (toyhauler version of artic fox) and they are thrilled with it, and use it mostly year round. fact is I am looking to buy my own 28' desert fox here in the next couple months.