Mobtown Offroad Installation Inst. for 3rd gen tacoma plate steel rear bumper

Does anyone have a copy of the Mobtown Offroad installation instructions for their plate steel rear bumper? I've had mine sitting on the front porch for several years and decided to install it. I found a youtube video detailing another firms install and the installation appears to be pretty much straight forward and I think would be applicable to my install. There was one step where they installed the bumper and then got it lined up with all the right clearances but just lightly tightened the bolts that hold the bumper to the frame. Then they drilled one more hole on each side through the attachment plates and through the frame and installed a grade 8 bolt in each hole. They said the reason was that even with the normal bolts tightened that when using the hidden hitch and a trailer you still might get some bumper shift. I think it was a 3/8" bolt on each side. Does anyone know if this same step would be necessary on my Mobtown Offroad rear bumper?