It not only protects the lower unit in transit, but also helps protect the transom. If you trailer a boat, it is a must have. Somebody probably heading to the lake for memorial day. This one usually fits on 150hp motor with trim, or can be used for less. Probably didn't trim down enough and shook loose. That motor probably weighs 200#, so on these bumpy *** roads, it would be like a grown man jumping up & down and pulling on the transom, not to mention the static hold of the electric trim. Somebody is pissed - but.... it ain't me, he he.
Transfers the weight of motor to the trailer instead of pulling on boat transom.