I have a 2013 Rockwood TT lite. It is 26 foot long. I traded my 04 Nash on it. I never had any problems towing the Nash which dry weight was 8300 lbs. The Rockwood which its dry weight is 5717 and...
You just need to use a stabilizer bar on it. I had the same problem with our new 17ft TT. I bought the stabilizer from our dealer and it totally cured the problem.