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Grade 8 in my opinion. Better to have it too strong than not enough. The regular grade stuff will hold for about ten miles (ask me how I know) Good Luck.
I thought that I had read something about grade 8 being the strongest in tensile strength, but that grade 5 was stronger in shear strength. Since that's what I'll be dealing with with the shock mounts (shear, not tensile) should I use grade 5 instead?
Grade 8 all the way. When I wrecked my Jimmy most of the force went through my front driver side tow hook which was held on with two grade 8 bolts. The frame bent but the bolts held. They didn't even come loose, or show any signs of damage at all.