I would go with it hammer. It takes alot of force to shear off a bolt sideways, even stainless. That is assuming they are tight and not "overtight". Overtightening stainless can certainly lead to its failure. Snug em up good and call it a day using nylocs so they cannot loosen up. You're also talking about 4 3/8 dia bolts here. It would take alot of force to shear that off.