What is the weak link for Chevy max tow ratings?

Groover wrote:
I have never seen a pickup builder discuss what the week link is but the last time I checked Allison does only rate the transmission for 300hp and 30,000lbs. I know that is the week link on my motorhome. I like to think that Allison is very conservative but then again I can't convince myself to test that theory. I hate that I have a rig built on a Freightliner chassis with commercial truck underpinnings hamstrung by an underrated transmission.