We towed our Mojo loaded up, 1/2 tank of gas, people, dogs, etc. and found out that we blew a rear air shock after getting to Norris. Had no idea how long it was bad, but after replacing both air shock in the rear, wife and I both had to adjust the memory mirrors and gas mileage went back up. It doesn't squat at all since replacing the shocks.

I'm sure you could add helper to the Durango. Again, you are only towing heavy 5-10% of the vehicle's life. I would rather enjoy the ride the other 90-95% of the time and be able to handle the boat when needed.