(Medium bug) Service truck movement

[wug]

I know the whole tracked physics thing has been brought up before, but service trucks seem to be affected worse than the others.  Maybe it's due to its small size, but I generally have one or two of them pretty much permanently stuck in my base at any given time.

Also, sometimes they like to climb walls/objects/monuments and get stuck, and sometimes they hit some invisible object and do the twirling dance in mid-air.

I'm not looking for how far they will fix things or how "smart" they should be.  I just want a service truck that can follow me around. :s