Cab configuration and bed length is all about tradeoffs, whether you're talking Regular-Extended-Crew-Mega or 5.5-6.5-8. Everybody has a different opinion on what's best. I like my crew cab 6.5 overall, but I've been in situations where a shorter truck would be better and I've been in situations where an 8' bed would be better. I couldn't see myself ever buying a 5.5' bed but I would see myself waffling some between a 6.5' and 8'.