i started another thread a while back on same topic.
P1000 - PK1-3 bed storage rack?
there's a little input, but i'm still lookin myself and plannin to have a rack built. have a couple ideas, but havent had one built yet. Nothing out there that ive seen, so will build custom. For now, i've been using three rubbermaid action packers (tough, water & dust proof). Large one for jackets and other items to keep dry or clean. One of the other two smaller boxes is my fire box (paper, propane torch, kindling, + hotdog cookers). The other smaller box has misc tools that are always along (jumper/booster pack, air compressor, tire plugs, tool bag, fire extinguisher, spare belt (for my atvs) extra straps, 1st aid kit, and other stuff...)
Still have room for cooler, saw, axe, shovel. Added an adjustable shower curtain rod to keep them from moving around. actually works pretty well. one bungie over cooler as seen in photo. With a rack, i hope to add a jack and spare, and mount that fire extinguisher/shovel/axe/saw.