By the looks of it you copied and pasted from ABS? If you did, and didn't touch anything on the cart, some possible issues:it is now. the cart still wont move tho..
I think the trigger is the one above the cart. You can see that the blinking light flashes when he's on top of it.It doesn't look like that the cart has even trigger_capture_area set in hammer.
Nah, it's there, you can see it on the edge of the third screenshot. It's only invisible in the fourth one because the camera is inside the trigger volume.It doesn't look like that the cart has even trigger_capture_area set in hammer.