Looking at your photo it looks like you just "hang" the other half onto those tracks, right? Then nothing more than a couple of pieces of oak or maple and a bit of handy work with the table saw and a dado blade could make them in a hurry. Then use some heavy screws to mount them inside your trailer. I would mount the new ones at a point that the bottom of the auger shield would be resting on the floor to alleviate any extra weigh bouncing around.
