Just a minor update, in case anyone considers doing the same: I put mongoose on both TF and KD and it works great for tanking, or even farming:

Hey I had 2 mongoose buffs on me, while using only one weapon with the enchant on it Smile

How? I started with KD then swapped to TF:

Yeah, noticed that too. Likely a bug waiting to be fixed, I had vision's of grabbing a 2nd Gladiator Shiv offhand with a 2nd Mongoose enchant and swapping it in to get 3 mongoose procs ;p

That has always been a 'bug' with Crusader as well. Back in Naxx I would swap to two fast weapons for execute spam and having 3 Crusader procs running was not unusual.