Mind Reader Rolling Storage Cart

I bought the cart four years ago. It was a great size to keep under my writing desk that I used for my keyboard and monitor. I typically would move it out twice daily to use as a side table and to store paperwork (probably about 50 pounds including the weight of the cart). However, the metal/welds holding the castors (wheels) is thin/weak so all four failed. Eventually, I ended up buying a small furniture dolly to replace the castors (about $17 for one with two swiveling casters and two fixed casters with 200-pound capacity or $34 for two with four swiveling castors with a 400-pound capacity)