Truck & Trailer rigging on constrained path

[jj2]

I'm attempting to rig a semi-truck and trailer to a constrained path.

 

I experimented with the following instructions:

 

Quote:

I was just figuring how a normale trailer would work (and define its position/rotation). so what you need, is a dummy at the center of your middle axle of your trailers wheels (depending on how many axles, it's either the midle axle [uneven number of axles] or its between the axles [even number of axles]. call this AxlePivotDummy or something like that.

 

Then you need a dummy at the pin of your trailer where it is hooked up to your truck (which defines where its going and everything). call this one PinDummy (or propably somethimg more meaningfull.).

 

You link the PinDummy with your Truck (so it moves with the truck). Then you add a look at constraint from your AxlePivotDummy to the PinDummy. That drives your rotation of the Trailer.

 

And now you need some sort of PositionConstraint for the Truck that is driven by the PinDummy. Not sure how exactly that could work, but maybe you'll figure that one out

 

sorry, that it's just half an answer, but maybe it'll point you in the right direction (or anyone else )

 

http://forums.cgsociety.org/archive/index.php/t-1043208.html

 

It seemed to work for me when I was using just two basic primitives. Here's the .max file:

 

http://www.filedropper.com/trailer_3

 

However, when I tried to use the same method with the actual model, I can't seem to get it work. I must have screwed up part of the procedure or something. Here's the file for the complete model:

 

http://www.filedropper.com/riggedtrailer_2

 

As you can see, I can't get the tail end of the trailer to follow the second dummy.

 

Any thoughts as to what I 'm doing wrong?

 

Any help would be greatly appreciated. Thanks in advance!

 

I've also tried this:

 

http://forums.cgarchitect.com/22505-train-truck-trailer-setup.html

 

But the bone rigging didn't work for me at all.