How do you know how to replace a tyre with a cart
If they want to try, can prepare: two people, then there should be a crowbar, the tyre, first with a crowbar, pry tyre side, and then down to pull out.
Loading is slowly one layer, and then let the person next to help you set in place to hold, remember a principle, is to plug in, when is all in all, success.
You can find a bike for your outfit, because if it's not professional, it's hard.