Couldn't use it on the last boat. Had no front end weight on the tounge with a dual axle trailer. New boat is way to heavy. Also bought at harbor freight.
Also bought one from Harbor Freight and use it to pull an '06 Supra 21v on a dual axle trailer out of the garage. That is on concrete though. You'd be hosed on gravel.
I just got one for my 24 SSV. It is a bit tough but it is mainly just to move the toungue sideways about 2 feet to get the angle right for the garage. I am not sure I would want to use it for any disctance. I agree that the gravel would be very tough.