How to make a wooden box with three wheels for selling and storing ice cream?

I started selling ice cream more than ten years ago when a carpenter made me a wooden box.

The wooden box is not a problem, mainly because I made six small quilts, which are a little thicker, one at the bottom and one at the four sides of the box, and then covered with a bigger quilt. When it is used, it is covered with a layer of cloth, and the effect is very good. Later, some people directly nailed the small quilt to the box with foam.