The truck in the foreground has been adapted to carry long timbers.
I don't think any modifications have been made to that truck. The cab is narrower than the bed or the footboard and front fender. The boards are just resting on the fender, and appear to be strapped together. The sideboards on the bed keep the load on the truck. The load may possibly be tied down at the rear of the bed.
I can almost see an employee in the passenger seat with his arm out the window, keeping the load from slipping off the fender!
