Full-sized trucks can pull large yachts.
Biggest yacht you can tow. Although you can get away with 10 in alot of places without much risk. The largest Super Class Cs are built on a class 8 semi chassis the largest vehicles on the road today towing as much as 40000 lbs. Here is a link for state by state towing laws.
The maximum length is 7 metres for a trailer towed by a vehicle weighing up to 35 tonnes 3500 kilograms. Remember that the most awesome boat isnt necessarily the biggest or the one with the most bells and whistles. Large trucks can tow speedboats sailboats and cabin cruisers with a dry weight of 8700 lbs.
Another thing to consider is brakes. In North Carolina where I live you have a wider legal towing limit. Length should not be a problem as most states allow 65 including trailer and tow vechile max length.
The biggest concerns about trailering an oversized boat are dealing with state. A center console boat over 32 feet used to be an oddity but now you see them at the boat ramp more and more. Maximum boat size for towing.
I have a Sea Ray 268. I tow it twice a year with a 12 ton pickup other than that it sits in a slip for the summer. Max height is 46 metres and length of vehicle boat combo is 19 metres without permits.
The Super Class C tows the most out of any motorhome on the market and has the most horsepower. The 2019 Jeep Wrangler in the Unlimited Variant Model can tow up to 3500 lbs and that is quite impressive. If you want the Jeep Wrangler with the highest towing capacity then you will want to go for the 2019 Jeep Wrangler in the Unlimited Variant Model.