No I have not seen that....I have used my headsail car (moves fore and aft)...as a cleat upon occasion, just to stabilize the boat in a storm, etc....not often though...I do not have the standard cars that came with the boat, but rather some pretty stout
harken cars that are hell for stout.....all in all though, I have not used the harken cars for that purpose more than once or twice
in the last 5 years.....I've used the harken car to hang bumpers on as well, but again, not often at all. I have some very large
bumpers 12-14 inch dia....that I hang off the starboard top lifeline when I leave the boat to return to Wichita in case of storms with heavy winds...