Rich, did you really mean that birdcage won't go through a rear MegaCab door or did you maybe mean the QuadCab? The MegaCab rear doors are huge, maybe largest in the industry (not positive if they're the largest but I think so.) I know you prefer the longbed, which has not been available in the megacab so I thought maybe you really meant it won't go in the quadcab? Here's the megacab doors.
FLSTS03, you're correct that the new Dodge cab for 2010 is an enlarged quadcab to be comparable to the crewcabs on the other brands. Originally I heard they would drop the megacab, which is the largest cab in any brand in this category of truck but now I'm hearing they'll carry it over.