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Message: [QUOTE="BillSU, post: 3278113, member: 6809"] I suppose I've seen this before on other trailers delivering product but just noticed while they were getting the truck ready to leave that they can shorten and extend the length of the trailer to accommodate long spirals, in our case. It looks like the deck of the trailer is mounted longitudinally on two large round extensions that may run the entire length of the trailer and they either crank it closed when the load is finally off loaded or it's run by battery power. Anyway pretty cool. [/QUOTE]