You might also want to check out Uline’s Instrument Carts:
I bought one, I think it was Model # H-3739 if I remember correctly, and it worked ok for my application. I liked the fact that it’s a cushioned cart.
One thing you might want to consider is whether or not you want to build an enclosure for your TAZ in the future. Lulzbot’s build it yourself CAT Guard enclosure is 33 Wide x 28 Deep. The cart is plenty big for the TAZ to run on, but I put a piece of flat MDF board from Home Depot on top of the cart so it would be deep enough for the CAT Guard to rest on. Not sure long term if the MDF would have warped requiring the bed to be releveled. I have since moved the TAZ to a stainless steel table so I no longer am using the cart, but it worked ok while I was using it.
Also, since I was running the TAZ on top of the MDF board, I’m not sure if the vinyl surface on top of the cart would have compressed slightly over time or not.