Thinking about a tool box

Well, my Volvo 780 probably has more room than any other tractor but I still want more. I'm looking for a place to store my tools, straps and battery powered blower I use to clean out the trailer and to just free up some room in my side storage doors. It's pretty full in there because I have two 5 gallon water tanks. Also, I want to stock a few filters and small parts. I do not like to be unprepared on the road.

I'm thinking of one of these on the frame just in front of the catwalk.

Northern Tool + Equipment Flush Mount Gloss Black Truck Tool Box —Aluminum, 60.5in. | Northern Tool + Equipment

I can't find a better deal for the price. What am I not thinking of? I have never had to move my 5th wheel forward enough to where the trailer might hit it. I'm guessing the cabinets that flatbed guys run are much more expensive but I don't know where to find them anyway. I'd love to know what some of you have come up with.

TIA

 

Those look nice but none fit my needs (at least that I can see). That in-frame one is a cool idea but not big enough. The rest look like side mount boxes and my Volvo has full fairings. Even if it didn't there's no room with the tanks and APU.

 

Like this one. Very cool. I hadn't considered that. May give them a call.