If I understand correctly it looks like you have approx 15-18" between the unistrut and angle. Rather than the aluminum angle I would use aluminum flat bar...maybe 1/4" (or 3/8") x 2". Space them to mate with the mounting holes in the board. You could mount the manufacture's mounting accessory or possibly add studs to the bar similar to the mfr's mount. ♦♦ Instead of triple nuts, use stainless locking nuts with nylon inserts. ps...I've never seen a real traction board. Mine always looked like broken branches. KenA
