Print using "Choose paper source by PDF paper size" Mac + Brother printer

I have a MacBook Pro using OS 14.0 and a Brother dual tray printer. I have contacted Brother and walked through uninstalling everything and reinstalling the drivers. Brother claims it is an Adobe issue. I have PDF documents that are very large (upwards of 100 pages) that are mixed in Legal and Letter sizes throughout the documents. I need to be able to print the document and have my printer detect what document size it is. I would think the "Choose paper souce by PDF paper size" checked box would have done the trick, but alas - no dice. I have uninstalled and reinstalled Adobe Reader (the one I started using first) 4x - then I got so annoyed at not being able to find an answer or being able to speak with someone about this issue I signed up for the Acrobat Pro version (7 day free trial) to at least try to get some answers). Again, no dice. The "IT" person who was helping me via chat had me uninstall and reinstall Adobe THREE TIMES (?!?!?!?!). For the life of me I can not figure out a work around or get in contact with anyone who has been able to make this work. I wish Apple's Preview had this feature. So. Help?