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I'm kind of cowardly about these things. If I absolutely HAD to have a 13 foot ladder I would start with a 12 and build leg extensions. Prolly cut 4 one-foot pices of 2x4 and 4 three foot pieces. Sister a short piece flush on the end to each long piece with bolts, then bolt one of these to each ladder leg, with the leg resting on the one-foot piece and bolts attaching the remaining two-foot section to the outsides of the ladder legs. It's cheap and Way faster than cutting a long ladder down.
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