Alternate thoughts,
I went to a medical supply house and picked up a medical services cart. I positioned battery chargers, clamp on small vise, clamp on magnifier light, tie wrapped a terminal strip, added some clamps, basic tools. My version of a medical Crash Cart:
Then I went to an auto supply shop and picked up an over the fender service cart. It has various screws, clamps wire I.D. tags, colored tape, soldering supplies, wire strippers etc. These two carts can be rolled to any location on my far flung RR:
The base of the auto cart is perfect for holding 2 four compartment screw trays, plus a tray for a biscuit joiner & miscellaneous supplies.
Plus I strapped on multi colored rolls of 10, 12 14 & 20 ga wire on an assortment of furniture dollies. It is starting to come together: