Idk if anyone has attempted doing this, but i came across this video. This company specializes in towing huge things with normal Cars so you font have to go out and buy a big diesel Truck as a tow vehicle.
In this link they are using what appears to be a Super V8 XJ to tow a 34ft Airstream which weighs about 8500lbs. They use some kind of special hitch and proportional trailer braking system. Its pretty impressive to watch.

 

Whoa! Time to buy me a boat!