I don't, but I've done some 4wheeling in soft sand. Other than the obvious rack of PVC pipe rod holders in the front, I'd recommend some sort of self recovery device. I'm fond of a hand winch/come-along. They're small, powerfull, relatively light weight, and available for arround $50. The biggest problem with the beach is that there's usually not much to hook yourself up to if you do get stuck. I've had do find some steel rebar and drive it deep into the ground (vertically) to have something to winch to. I've also seen, but never used, several anchor looking devices that dig themselves into the dirt/sand as you pull on them. the adds say they work great, but then again, they're selling it too.
Sorry, but that's about all I've got.
Good luck

Johnny