I realize I'm late on posting to this thread, but we have a 255RKS, and absolutely love it. The island is the best thing to ever happen to a travel trailer. I posted to another thread here:
Detailing a few gripes, but overall we are very happy with the layout, and the quality of the product has been as expected.
The trailer tows nice. Even with the fresh water tank full and the TV loaded with dirtbikes and such, we tow over the pass easily with a 7.3 Powerstroke, piece of cake for your Chev.