I think they should be a pretty crap vehicle. Not a whole lot in the way of modification, barely any protection, but the one upside is that it doesn't require a lot of parts. It's a "Well it's better than walking.." vehicle.
The bike from DayZ was actually quite a useful gadget. It had a decent amount of speed, required little to no care other then general repairs, so no need for gas, and also had off-road capabilties.
We should focus more on vehicles that would actually benefit gameplay, even though a golf cart does have lots of parts that could be scrapped for other craftables, such as its energy-powered motor and plastic/aluminum shell.