The thing on the Responder's (ex-Empire State, owned by Conoco-Philips; ex-Exxon Empire State) stern is an oil containment boom. At some point in their lives, all three boats had booms. I assume McAllister removed them from the Charles D. McAllister (ex-S/R Bayou State) and the Roderick McAllister (ex-Delaware Valley, I believe) when they bought them, as is evidenced by the welds, and cut stantions on their sterns. The reason the boom is still there is due to an agreement with the Bayway (N.J.) Refining Company that she be able to respond to any spills or other emergencies at the refinery, as well as McAllister hoping to make her into an oil response vessel.
Kent, Mammmoet lifted the bridge up from the pier where it was built, set it in place on the comtainers which are up on top of a total of 17 self-propelled trailers (with a total of 1088 wheels). They then moved it across the pier onto the two barges, Chesapeake Trader and Atlantic Trader, which they had basically turned into a giant catamaran. When the bridge was in place, they then deballasted the barges as the tide went out, lowering the bridge into place. It was quite an awesome event to witness and be a part of. Look for it on the History Channel's "Mega Movers" sometime in the next 4-5 months.