Any CJ, CJ variant (scrambler) or wrangler or wrangler variant. The gladiator mostly gets the wave too. You can get the wave in an original Cherokee if you have modified it-but not if you haven't modified it. If you don't wave back, you're dubbed a "mall crawler". Which, you know, is like having a red pac 12 sticker on your truck bumper. So, raise two fingers off the steering wheel (the actual waive) and enjoy the brotherhood/sisterhood. You never know when you'll need their help-but you will need their help if you drive a Jeep long enough.