At school, we pull kayak trailers all of the time while the van is full of people and you are correct that they don't have a lot of power for pulling. With the lighter of our trailers(2000lbs loaded) I have yet to find a hill in NH that will drop the speed from 70. With the heavier trailer(4000lbs loaded), speed drops to 60 real quick, then it downshifts and holds there. If you don't mind 60, pulling 3-4000lbs isn't too bad but I wouldn't pull anymore. The go pedal is a little weird because there seems to be a downshift switch if you push real hard on it.