It seems like we all are thinking of different uses.
Big carts with air tires and vices are great but for me they are bought by the shop and delivered to the job by our truck.
The one I was talking about above is my own and small enough to go in the van no problem.
I use it when doing small jobs in occupied commercial buildings. I put a holder on it that carries a six foot ladder vertical but low enough to clear doors.
The big metal carts can be rough on walls, glass doors etc.
So John what are you looking for?