[rotorwrench]

The guys that mention size have it pretty much correct. Less than a full load or LTL freight is more influenced by size than weight but weight does have an affect. It is likely that any load between 200 and 400 lbs would be the same in cost difference but size can boost it up also. Distance to ship is a big factor as well. Call a local shipper or a freight broker and see what the weight ranges are. Shipping freight collect is another possibility but it is nice to lock it into a set price.

Density is the factor between size and weight. This is what the class is based on. If it was disassembled, the density would be less if bundled on a long pallet so the class would likely be lower.