I have a B7300, and had a friend weld up one for me, not big, but a help for sure....basically it is a frame to hold about 10 4x8x16 solid cement bricks, or about 300 lbs plus the frame, if I did it again, would have gone larger but for now it is better than nothing..may have him weld in a piece where "board" is, and put legs on it so it is easier to attach/detach