FrankoToo wrote:
Saw a TH on the road not too long ago where they had bolted steel channels to to the door on the outside. If you picture the door in the up position, the channels ran up and down. Thought it was kind of odd when I first saw it but then realized that's probably what they were doing, reinforcing the door.
Rather than channel, box tube would be stronger. Maybe 1-1/2" square. But you have to drill access holes for installing the nuts to bolt them to the ramp. Use grade 5 or 8 bolts for a smaller size bolt and nut, but fender washers on the bolt head. I'd use two in the area of each tire path. You can also use temp blocks in the center of the ramp.