Well, it's not a crash cart, obviously, but it's my tool cart at work. If Batman had to push around his best weapons in a Rubbermaid cart, maybe it would look like this. Or something like that. OK, the Batman thing's a bad metaphor, but this is the cart I use at The Store as I roam around, fixing stuff. Most of the tools I tend to use on a daily basis are here, plus some I use a bit less frequently.
On the top shelf, there are three main items. First, and most obviously, is the case for my DeWalt 18-volt cordless drill. That's the only power tool I tend to wheel about as a matter of course; I do have others at my disposal, but I use none of them frequently enough to elevate to "Cart" status. Beneath the drill case, not really visible, is a flat box that is separated into a bunch of small compartments. This box contains screws and fasteners of different sizes and types.
In front of the drill case is my main tool bag. It's an electrician's bag by Husky, and this one contains the hand tools that I use most frequently. Here are all of my screwdrivers, nut drivers, lineman's pliers, diagonal pliers (sometimes called "dikes" for short), tongue-and-groove pliers, locking pliers, hammer, combination square, torpedo level, probes, inspection mirror, Allen wrenches, digital multimeter, and so on. The tape measure you can see there is my backup; my main tape is always on my belt.
On the bottom shelf of the cart I keep things I use less frequently. Way at the front, tucked near the corner, is a box of electrical repair supplies: wire, wire connectors and nuts, cable ties, fuses, and the like. Behind that is a second tool bag in which I keep things like crescent wrenches, a socket set, chisels and files, a flashlight on a folding tripod, Torx drivers, and most of my drill bits.
Behind that tool bag is a plastic tote that contains my kneepads, an extension cord, two kinds of Velcro, WD-40, air duster, wipes, and fishing line. (This is for hanging signs at work, which is a big part of what I do.) There's also a canvas pouch teetering there which contains my safety glasses, earplugs (essential for me when I'm using the table saw), a knit hat, and two pairs of work gloves.
Up top, by the handle where I push the cart, are several small compartments where all manner of stuff tends to accumulate: screws of odd sizes for which I have no assigned space in my fastener box, note pads, pens, and various other little things that pile up in the course of the job. Throw in a cup holder, and there you have it: my Cart of Infinite Repair. All I'm lacking are missiles with which I might target and destroy my foes!