Never heard of one. Many years ago the box car special was made in a 6K, 7K 6K, 10K , 12K (Paper Roll Handling Special) capacity (cushion tire). Designed around handling 4x8 sheets of plywood in 40"6" inside length box cars - this maybe part of history now. Most plywood bundles range in weight from 2600 to 3200 lbs. With a bundle of 3/4" Marine grade plywood being the heaviest. Common lift heights were 197" triple stage. Of course, & the PRS unit was for working paper rolls inside box cars & only sold for use w/ PRC and used to handle 6500 lb - 60" dia rolls (almost part of history too)
Possibly this guy is look for a unit with a net lift capacity of 5 to 5.5K with triple,, side shift. You might ask
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