honestly Jerry, clean-and-jerk a 100-lb kayak over the side of a car is not desirable or even healthy.
Staging ends to work the boat over the car is the desired approach, especially coming in from a day of paddling.
fwiw, the longer the boat, the easier to get done because of the angles and leverage.
Stevo loaded these alone in Kerrville, arriving here in Palm Harbor.
you can also use these things to stage as you're working your boat over car hood or trunk;
and I'm sure you can also figure how to use a mounted roof rack to stage a lift over the side of your car.
here, two of us are loading, and a truck, but bow staged on tailgate, the dolly wheels will drop out when I lift the stern.
But he loads even this at home alone, placing the dolly posts in the farthest aft scuppers, and staging the bow next on a ladder.