Welcome to the Workshop community @Tinyfeather60. I'd be happy to provide some ideas.
There are a variety of garden carts available that the sides fold down on. These would be perfect as you can transport gardening materials to where you need to work, then you would simply fold down the side and you have a bench. Perhaps a cushion would make it more comfortable if sitting for an extended period of time.
Another option would be the Craftright Creeper Stool. The wheels on this stool would be more suited to paved areas possibly sinking into the grass.
The Cyclone Foldable Seat Kneeler also turns into a portable seat. It doesn't have wheels but is a lightweight solution to needing to sit around the garden.
I hope some of these ideas are helpful. If you had something else in mind for a rolling garden bench, I'd be happy to come up with a solution.
Hi @Tinyfeather60 , I too use a rolling seat in my garden, and have repurposed an old computer chair on wheels. I actually took the back rest off, and also recovered the seat with a stronger material. The seat has been in use for over 5 years, I can move it around when I want, it’s very sturdy and moveable. Good luck with yours.