Center Pivot Steering

http://www.draisin.com/products/cargo-bike/

This Quadricycle would make a very good cycle truck (at slow speeds) but it may need a couple of motors.

 Two head tubes the horizontal steer tube connects to the vertical steer tube. The rear section is welded on the horizontal head tube. The steering wheel turns the center pulley with cables.

http://www.cargobikesystem.com/

http://commutercycling.blogspot.com/2010/01/httppython-lowracer.html