Finally! I gave up on this back in January but decided to have a go at it again today as I've been focussing on clearing up some of the achievements the last week or so.
Tried using mines, taking stuff out with the javelin etc with no joy. Finally just got really lucky and an enemy jeep stopped just in front of me near the hangars on Wake Island. Two guys jumped out, both started shooting at me and stood in a line....ended up getting a double roadkill!
Now I can put the Skid Loader on the list of things I'm not going to touch ever again in BF3, alongside Squad Deathmatch and the EOD bot!