Raggs,
My collection of images for the MAHAN class is limited at this time, particularly close-up yard photos. Plus if the hoses were painted to match the camo, spotting them is even harder under overhangs.
Here are a couple of close-up views of USS SMITH herself after the war prior to the Bikini Tests. She is less cluttered, but they would have retained fire fighting gear. Finding where they placed all the hoses isn't going to be easy (maybe not possible) unless there are views showing what is attached to the bulkheads under all the overhangs and on forward and aft bulkheads.
You can see one hose (or rope?) hung on a bracket at 01 (forecastle deck) aft of the bridge under the ladders in this forward deckhouse view. Also one deck below (at Main Deck level) there looks like there could be another hose hanger.

In this aft deckhouse, I couldn't locate any hoses. I strongly suspect that fire hoses in this area were hung on the fore and aft ends of the deckhouse under the overhangs. Or the amidships fire hose could be on the bulkhead under the twin 40-mm gun mounts/directors out-of-sight. In early war views, there can be seen reels for ropes and maybe fire hoses under the aft 53 mount shield protecting the 54 mount. It would be logical to place hoses there. But, I can't find a late war view looking directly in that area.

To give you an idea of some "possible" locations, here is a couple of good views of the rebuilt sister USS CASSIN. The configuration has been almost completely changed, but does show where fire hoses were desired. Looks like one pair (starboard and port) forward, one pair amidships, and one pair(?) aft.
You can make out where the hoses were hung clearly from their "white" color in these views.

Also, if you look close, you can see that a fire hose (or two?) were hung on the aft end of the aft deckhouse.
