I did some stress analysis. The stress is derived from Alum 7075-T6. Bolt hole plate is 0.5", holes are 12mm. Peg is 6.5" and overall length is 7". I used a 600lbf spread evenly over the peg. This is a 2" wide peg. There is also a 0.5" radius on the bottom side of the peg above the bolt holes.
This is a very quick sketch. This should give everyone an idea of where the high stress areas are.