Moveable SObjects

[Kyle Puttifer]

Creating a canyon track with some armco barriers, some tyre walls, portable fences.

I used SObjects for tyre walls and portable fences (from Default XPack) and I checked moveable, but the car simply passes through and off the edge of the canyon. What I want, is parts of the SObject to be knocked off with it.
If I draw manually with objects, they move. When I use SObjects, they don't. Seeing as SObjects are (to use Brendon's own words) strings of objects, shouldn't each object piece move individually?
How can I get this to work?

 

[Kyle Puttifer]

Well it's only going to be a few breakable walls so that's not too hard. Thanks ehrlec.
It looks like I'm sticking with individual objects then.
But I imagine for more complex tracks, this solution would take a long time.