If they're flush on each end and have a cross bolt that retains them, in a perfect world they SHOULD just drive out. Load them up with grease or penetrating oil and make sure there's no load on them, then go for it with a piece of pipe (to protect the grease fitting) slightly smaller in diameter than the pin, and a hammer.
The ones that unscrew will have a hex end to accept a wrench; though I've seen them mostly on Jeeps.