I own a Four Winds Five Thoasand 28A that I use to travel for my work in the film industry. I currently am towing a standard shift Ford Ranger but need something with more passenger/cargo room and as much of its own tow capicity as possible. Many of my projects are associated with the water and require me to tow a 25 foot boat, ideally with the RV and at times with the vehicle that I tow behind the RV. The boat weights 4300 lbs plus the weight of the trailer. Is there a vehicle that can do both. Tow behind the RV and at other times tow the boat?