Makes sense, Is the same true for the extended tilt bars? Do you only need longer ones for larger cameras or do they help with the 5D?
If you're in the USA, Quadrocopter has a good selection of these: http://www.quadrocopter.com/Booms_c_160.html
I recommend the 200mm or 215, depending on what cameras you plan to carry. However, for $6 difference, I went with the 215. I say, better more useable length than not enough. =) Just my $.02