Back about 2 years ago.
Carts will be under the same rules as baskets. When that system is put into place.

Why would you restrict where people can place totems?

If you want to leave your heavy metals, others would have to try to pick them up with a cart before you do. Protect your area, or bring them back with you, or carry a cart with you to pick them up the first time.

Please tell me you are joking with the last one right?