Winner of the 2014 Ultimate 3/4-Ton Heavy-Duty Challenge

That would make the actual GCWs:

19,000# x 90% = 17,100# actual load for Ford F250
20,500# x 90% = 18,450# actual load for Chevy 2500HD
22,500# x 90% = 20,250# actual load for RAM 2500
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Ram had:
1,800# more load than the Chevy 2500HD and
3,150# more load than the Ford F250

Make sense now that the F250 was fastest up that grade (time wise), followed by the Chevy, then the Ram? :S
The Ram still got to the fastest peak speed however.