My job trailer is also a 6x12 and I outgrew it real fast- will be picking up a 7x14 tandem axle hopefully this winter when stuff cools down a bit and I have some time to switch over. The way I have mine setup currently is a 42" wide shelf in the center up front (round nose) with a cubby on the passenger side for easy access to my hand tools and such from the side door. Rest of the passenger side is hooks for ladders and rolls of tubing, with floor space for air compressor, glycol jugs, boxes, etc. Driver side is a jigsaw puzzle of homemade shelving; top is a horseshoe for 10ft sticks of pipe, then underneath I built 6" slots slightly tilted toward the exterior wall for drill/impact kit, porta-band, pecker saw, hammer drill, solder kit, and socket set. Next to that is the same tilted slots, but full of those Stanley fitting boxes. Behind that is a 6ft long slot up top (under the pipe rack) for shorter lengths of pipe and allthread, unistrut, etc. 6ft space under that to the floor for generator, drawer organizer, chain vise/tri-stand, acetylene torch, and whatever happens to land in there. I'm pretty happy with it, but the 7x14 will have a V front like yours and I intend to build a flush shelf all the way across with maybe 4 or 5 tiers for heat exchangers, pumps, mixing valves, and the like. Bigger parts like that which don't fit on a regular shelf. Might try to incorporate a large drawer organizer in the center of the V for extra fittings and whatnot that don't fit nicely in my fitting boxes. I can get you a pic if you want, I am going to reuse my driver side assembly in the next rig as I do really like it