I had Harken adjustable cars on my C&C 29-2 and now on my C&C 110. They are expensive but they work so much better than other adjustable cars that I've used on some of my friend's boats. As a direct real world comparison, one of my friends who also had a 29-2 had Garhauer make custom genoa cars to fit on his existing Merriman tracks. The fit was great but they were extremely difficult to adjust under load. When the tension on the control line was released, the car would not move aft. Even when there was a considerable wind load on the sail which should have been enough to allow it to move on its own. He had to pull on a line that was attached to the rear of the car to move it aft. In fairness, the Garhauer cars did not have ball bearings like the Harken cars have. My present boat is approximately the same size as your boat and the loads generated by the genoa are similar too. I have no problem adjusting the lead location even when the sail is fully loaded. I would think that if you installed a Garhauer car on a boat larger than the 29-2, you may be disappointed unless you don't mind unloading the sheet before you make a forward adjustment to the car.
Ted Drossos C&C 110 Lady in Red Long Island, NY
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