The car harpoon looks like it would be similar to bumper spikes (UACfH, p. 41), but the ability to hang onto the target and pump tear gas inside is way beyond normal CW rules. Although since current cars are woefully under armored, that does mean the harpoons might not be that strong. Maybe something from Chassis and Crossbows?
Hmm … as I was typing that, I wondered if there had been any Uncle Albert’s updates since UACfH was released in … GAH! … 1992? OK, so a quick Google later, I found this in the Pyramid archives. The Drag Chute Harpoon might be a good start, even if it’s not the exact same thing.
