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Yes, but you will have them securely tightened. And the total shear strength of all four bolts combined is much higher than many other parts of the hitch. My 30,000 lb pintle hitch that came on my bucket truck was held on with six grade 8 bolts.

I'd say Grade 8. The bolts holding the pintle ring on my trailer are grade 8, as well as the bolts holding my hitch to my truck frame.