I agree with Bikendan. Don't get anything bigger than 5000#. Even at that you won't like the pull. My first RV was a TT and my TV vehicle was rated to pull 8000# and the TT was rated at 7000# GVW and sold the TT after 1 season because didn't want that experience anymore.
Your best bet is to check with your state DMV to find out. I know that some states require a special license endorsement if you are driving or towing over 26,000 lbs. or if you are hauling paying customers.
Check with them.