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...
Are the tanks behind the axles? Check tongue weight empty and full. I prefer tanks in front of the axles when possible. Extra tongue weight doesn't hurt anything as long as the tow vehicle can handle it. You can always add a generator or other items to the tongue.