Camping is about temporarily living elsewhere, usually with fewer modern conveniences, so yes it absolutely has relevance to survival/prep, whatever you call it. I've long camped for fun and don't need it as a ruse for acquiring survival gear.

I accelerated my camping gear acquisition twenty years ago precisely because a week-long series of ice storms and power outages made me thank God for the gear I had and its utility for comfortably surviving an emergency situation.

Car camping can be good practice for "bugging out" (my gear is always packed and I know how much can fit in and on the car and how long packing it takes) and for living in the backyard if need be because the house is uninhabitable for some reason. I have a teardrop trailer stored 100 miles west of Washington and that could prove useful in some evacuation scenarios.

After the week we've had around here (earthquake, Hurricane Irene), preparedness is a pretty common topic. Heck, since 9/11/01 it has been a perfectly normal conversation around here. But that's not to be confused with a TEOTWAWKI sort of focus. I'm not in that camp.