my kids love ducking other jeeps. We had to calm it down since we went through a crazy amount of ducks in one day. So now, the jeep has to be "really" cool and not just something with a jeep logo. So house rules for us are:
(All rules are subject to exception on extremely limited basis)
NO STOCK JEEPS
NO Renegades, Compasses, Patriots, or Cherokees (unless a modded XJ), Grand Cherokees (unless heavily modded) or wagoneers(new body)
Mall crawlers (skinny rubber band tires and huge rims) get only clown ducks (yes a duck can be an insult as well)
Y'all are free to modify for your personal enjoyment!