How you arrange it depends mostly on your own situation and method of operation. How many machines, line drivers, blowers and so on are you hauling? How about the tow vehicle what do you want in it? Is it dedicated or also personal vehicle? One size don't fit all. A couple things we have found helpfull is a tongue mounted tool box on the trailer and a roll out platform in the truck bed especially if you use a shell cover on the truck. We haul all our cones and paint in the truck. It has a shell so can be locked and the roll out is a life saver to get the paint cans out. The side door on the trailer is a great place to hang tools and stuff you use often. Our best add on was a porta potti mounted on the front wall of the trailer just high enough two paint machines could roll under it. It has been a life saver several times.