Just out of curiosity, where/how did you have the carts made?
At least they seem to be having fun with it...
A message from the Lawyers at Velcro Company:
https://www.youtube.com/watch?v=rRi8LptvFZY
I hope they don't try to shut it down too, I only mention Etsy because they do "go after" little guys making crafts with their products. Having to call it it a hook and loop fastener just sounds dumb though and no one will know what you're talking about when we all know it as Velcro.