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Interstates are probably the smoothest available highways for your equipment. Your best bet is to wrap your equipment in the best way possible in the first place, and stick to interstates. (I-80 to I-29 to I-70 to I-79 to I-68 to I-70 would be my recommendation. I'd stay off the PA Turnpike as that one IS rather bumpy in places, and also costs an arm and a leg in the form of tolls. Thus, the recommendation to take 79/68 and back to 70.)

Donna