I have really been happy with the Keystone lineup. Very good quality and customer service. The Cougar series which I have has 3 half ton towable models. Jayco I have heard good things about as well. They make an entire lineup of "lite" 5ers. Check out
Cougar Division of Keystone RV manufacturers of Recreational Vehicles and Towable PopUps. and you will be in the Eastern models. Very well priced for the options you get and the best insulation values I have found in this class of 5ers. The only "must" is airbags. My truck can tow this w/o but I have a lot more confidence w/ them. I am going on a year and a half w/ the 5er and couldn't be happier. I hope this helps and let me know if there are any other questions you have about my set up. Good luck and happy camping.