Collie I checked with my local lumber yard about getting 12' plywood and was told "no way". The guy I spoke with said he used to work distribution for a major plywood company and he said the only way you get 12' plywood is if you order several thousand sheets from the factory.
I did find (courtesy of research done by JBarca when he fixed his leaky slide) a company called
Parkland Plastics in Elkhart that makes the OEM slideout floors like mine that are 1" OSB with a special coating on the bottom. IIRC, my floor was like 145" (just over 12') by 45" and they quoted me about $300 to make it. There was no shipping option for qty:1 so I would have had to pick it up at the factory in Elkhart...which I'm OK with a 5 hour drive each way, but how would I get it home? On the roof of the burb? The plywood glue and varnish cost me less than $100.
