A B-train combination. Since the lead trailer's wheel spread from the cab was so long, tried adding a pusher axle at it's center. I had a spare steering system from another R/C truck and wired it to the Mack Vision's steering system. It was really hard to steer when driving since the axle wasn't too even with the trailer's, but it worked.

Here's a short video to show it in action Notice that the motion of the pusher axle and the front steering wheels of the truck copy.