Simple, effective, slight modification.
I used the Blockhead to bolt in the back of my truck. It's simple and strong. However, I needed to use longer bolts, and since the top overlaps over the holes, I had to drill out the pre-set holes in the bottom of the mount. This allowed me to slide in the longer bolts at an angle, and get bast the overhanging skewer mount. It did the job and now it works well.