We bought a 1992 25ft Chateau in Feburary. Weighs roughly 4,500lbs loaded. We were pulling it with a 2003 Silverado extended cab 4x4 but it was 4.3L V8...We have since traded in the truck and got a 3/4 ton Avalanche.... Our biggest issue with pulling was the payload. When it was just me, my husband and the 2 dogs it wasn't to bad. But when my 2 teenage daughters decided they wanted to go along too. The truck was maxed out. I could tell the difference in the truck. And I'm not the smartest cookie when it comes to hearing or feeling new things in the truck.
There is a web page for RV's at http://www.nadaguides.com/ IF you know the year of the TT it might give you a idea what your weight is.