I’m in need of a shelf cart for a school project I am working on to be a movable display for a VR project. My budget is limited so I’m looking for either a very cheap (under $50) cart or to build my own. The car is supposed to hold a computer and a VR Headset so it needs to be sturdy and hold about 60 lbs.
At one point in time our neighboring tenant to the immediate north - Tempest Telecom - had invited us to remove the pallets that used to litter their loading dock area.
That would give you something fast, built and ready. I am not sure if it meets your specs. It would also give you a platform to modify. They are rated in the hundreds of pounds range.