runningbehind - 2/2/2011 15:19
Magnum trailers, Amenia, ND makes a trailer like that,
http://magnumnd.com/trailers.html two hopper trailers dump into a connecting Y pipe so only one discharge, biggest thing is getting a pretty good cleanout, might almost have to make a hopper into the trap opening to get cleaned out well, or deal with it at the end of the year. The Michaels system,
http://www.michels.ca/swing-away-grain-hopper.htm type system works good for a trailer with good ground clearance.
Hope the links give you ideas for your project.