i tried jeep waving this weekend.  only one guy in another sahara that looked identical to mine waved back.  no one else did.
i have been thinking about hwy it could be that only wrangler people  really wave back and i wonder if its because wranglers are open topped  so you can see hte people waving?  maybe since cherokees and grands and  all the rest are enclosed,  most people don't see the others waving?   sounds plausible to me