>Can the D800 and its >lenses withstand the shocks from going over cracks and >potholes in the pavement? Any ideas about how to carry the >equipment to minimize potential problems?
If your D800 and lenses were somehow attached directly to the frame of a conventional or recumbent bike, then the camera gear would be subject to a significant percentage of the road shocks that you feel as a rider.
If your D800 and lenses are carried in a camera bag which is, in turn, placed in a mobile trunk, soft panniers or a trailer, then you're effectively suspending the gear and separating it from direct transmission of road shock, as well as absorbing some of the remaining shock with the padding of the camera bag. Whatever other shock is still transmitted, is likely no mroe or less than that to which gear is submitted on a walkabout or difficult hike.
Soft panniers or a trunk will do nicely. Ride with peace of mind.