I've had great luck with my Heartland trailers. Great customer service, a wonderful owners forum with access to many owners manuals and information on the products but best of all is the owners club. Many club rallies all over the country and we have made lifelong friends there.
If you are thinking of full timing in your new trailer, keep in mind that the Grand Design is not warranted for full timing, only extended stay, while the Big Horn is rated and warranted - in writing - for full timing.
I have run my truck and trailer through the Blue Beacon washes and used their Rain-X rinse. I specify low power (power wash), no chemicals and the Rain-X rinse. Both truck and trailer come out sparkling.