Tried this one about 5 times today and combined with the cooldown on the bombs and the flight time between the questgiver and the camp it is impossible to do this solo.

No one else was in the area, I never had trouble finding things to bomb, in fact the cannons never fired at me(probably a bug). I was constantly waiting on the cooldown to bomb the next stack and the fastest time i could get was 2:05(using the blizzard stopwatch function).

I didn't get to try it with a group but i am sure i could accomplish it then. I was just hoping this would be soloable with some skill and an epic mount.

Providing your best times would be really helpful. It will be tuned around having an epic mount and NOT having Crusader Aura.

Also, eventually there will be protection in against doing this grouped. It will be a solo achievement so don't bother testing it in groups.