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So long as you get an American-made grade 8 bolt, you should be OK (some Asian-made bolts are not what they claim to be as far as strength rating). Ask a local hitch installer (U-haul) what strength bolts they use. A local jobber like NAPA or a good hardware store will have authentic graded bolts. I don't know about Lowes, it might depend on who their supplier was last month but they do have a decent selection there.
You can also try Bolt Depot
http://www.boltdepot.com/DefaultB.aspx
where there is an almost limitless selection at decent prices with a good turn-around time.
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