Re: car shaking when towing pwc
I agree that a pic or two of the setup would be helpful.
You do have the ball and coupler matched?
And pictures of the setup -- front to back may be worth a thousand more words. Since you feel this when towing, braking becomes more intense and therefore a warped brake rotor can make a pulsing feeling in the car that you might not notice at or as much when not towing. That doesn't account for the feeling when accelerating however. The push-pull feeling is relatively normal but may be more or less noticeable depending on the load, the vehicle and the roads you travel on. If this push-pull feeling is evident at very low speeds (say less than 10 mph) then you really need to look for loose wheels, bearings going bad, suspension issues, loose parts in the hitch trailer frame.
I agree that a pic or two of the setup would be helpful.
You do have the ball and coupler matched?