The poor old catering cart gets a right bashing in the line of duty. From the obvious treatment in the air, bashing seats, galley corners and crew legs many times a day.
It gets far worse in the catering co. it has to withstand hot and cold washes, pushed into other trolleys, walls etc then loaded onto a truck often with heavy boxes or ovens on top whilst they are loaded with food, booze or dry stores.
Because they are quite expensive items airlines do not have excess stock and catering companies often have few spares to replace any damaged trolleys.
Repairing the wheels and brakes is actually normally a very simple task, door locks can sometimes be a bit harder to fix.
The problem might not be rethinking new carts but getting the airline to spend money when what they have does the job.
H