As far as I know, Excel and Air Stream are the only manufacturers building what I would call a higher end and better quality travel trailer. If you want to see some quality in travel trailers, look at the Avion, Silver Streak, Streamline and Air Streams built in the 1970's and 1980's. These trailers were built to still be on the road in 20 plus years.
That is my honest opinion. We have had plastic boxes from the current manufacturers and decided we wanted a trailer for the long haul for now.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot