This interested me enough to go a-googling ~ I was recently engaged in heated debate over sedan vs. coupe. My contention is that the primary distinction between a sedan and a coupe is that a sedan has four doors, a coupe has two. The jury's still out on that one.

In variations on my search criteria, I discovered a little something extra from Bartleby: Cad.

A low, vulgar fellow; an omnibus conductor. Either from cadet, or a contraction of cadger (a
packman). The etymology of cad, a cadendo, is only a pun. N.B.—The Scotch cadie or
cawdie (a little servant, or errand-boy, or carrier of a sedan-chair), without the diminutive, offers a plausible suggestion.

“All Edinburgh men and boys know that when sedan-chairs were discontinued, the old
cadies sank into ruinous poverty, and became synonymous with roughs. The word was
brought to London by James Hannay, who frequently used it.”—M. Pringle.

So, in my mind, a golf cart then becomes a direct descendant of the sedan chair. Fascinating! I think I'll retire to the saloon for a pint to ponder on that!