The small straps should be in their storage area. They have nothing to offer.
Haul one bundle of lumber at a time. MINIMUM of the two large straps from side to side. One or two more large straps side to side wouldn't hurt. Straps going from front to rear will do next to nothing, even if they are 4" wide. The load will shift under them. The side to side straps will get tighter as the load tries to shift. If the load shifts far enough the straps will snap, or the tie down points will be ripped off the trailer.
The trailer has house trailer axles. In other words, the brakes probably do not work.
The truck would be at least maxed out with one bundle and the trailer, if the trailer had good working brakes.