Made from a harbor freight welding cart about $50
I like the guy who hauls all his gear in a heavy-duty trash can bunjee-corded to a hand truck.
built a cart for 3 gun out of a baby jogger. It was $15 off of ebay. I built mounts out of double split set collars and tubing to mount ATV gun mounts. Enough room for a large range bag where the kiddo goes and a cooler where you would have stuck the stuff to clean them up.
The wheels lock so it stays put in the wind and it folds flat to fit in a car.