Harbor Freight makes a number of different sized moving dolly’s.
They can also be found at your local Lowes, Home Despot, Menards, etc.
Find sizes you like. For example the 30" hardwood one is perfect for stacking the 48" lengths of the metal field.
I use the flip top tubs for power strips / extension cords. I have dolly for every three tubs. Put the three blue tubs on the blue dolly (spray paint) and the red tubs on the red dolly and put them …
If you need a longer / wider dolly use a pair of 4" wide webbing straps with screws to attach them together. (Dolly end to end. Webbing under, then pull to the center and back to the end part and attach. Then do the other dolly the same way. When on the wheels the dolly ends are held together. In the parking lot, fold them and they become an easy to store unit.
Homer Boxes have all the electronics. https://www.homedepot.com/p/The-Home-Depot-19-in-Plastic-Portable-Tool-Box-with-Metal-Latches-and-Removable-Tool-Tray-17331512/202021300
I either strap them to a dolly with a long moving strap or use a folding wagon.
I have a pair of these Amazon.com wagons that I use to carry the Homer Boxes or smaller items. Walmart carries one that the rear panel folds down that may be better for you.
The use of straps / bungee cords makes it easier to load, tie down, and move. You then don’t need to worry about a load dumping out.
I have a rolling suitcase that carries all the laptops. It makes it easy to move them and easy to make sure that I have all of them. Pro tip, buy the metal side one.
At the end of the day, nothing I have is carried, it all has some kind of wheels, be it built in, dolly or wagon.
Last, if it doesn’t have your name on it, it will walk. And since you took the time to label it, add a number. It helps to be able to go “missing Raspberry Pi #12” and have people search for it.