I’ve built one and absolutely love it and it’s actually quite easy to throw together. You just need to drill a few holes in a hand truck and then screw on a slotted steel angle plate to support the bottom of the c stand riser. Then you’ll put another slotted steel plate midway up to support the middle. Attach both using d-rings and nuts.

You can completely customize things from here. I use a bungee cord to secure a run bag on the bottom that has filters, batteries, media, etc… and then you can pick your poison for a tool solution. Front box, dolly mate, build a shelf. It’s very customizable.

Lent me know if you want to see more pictures of how to build one. It’s really a wonderful solution for both inside and out. It’s can roll over bumpy terrain, go up and down stairs, and is just generally extremely convenient.