Update: so I've died once to the Quad but
it wasn't a roadkill. I hit some mines and the kills was attributed to the vehicle the enemy was in, which just so happened to be the Quad. Same way folks got the Skid Loader kill as well. Pish. Roadkillin' all the way for me.
3 Skid Loader kills and 6 Quad kills. 3 of them in 1 streak!