56Nomad,

I think NoMo is correct, at least on my 2003 3500 he is correct.
The data you posted suggests that also...

"Stud #1 Accessory Power/Trailer Wiring Feed..............takes a 40 amp fuse"
"Stud #2 Accessory Power/Trailer Wiring Brake Feed....takes a 30 amp fuse"

Don