I have something like the green cart in the pic for my garden. Shovels & rakes and implements of destruction go horizontally/longitudinally resting inside 2 x 15 cm sections of plastic sewer piping fastened to the bottom of the long edge at each of the corners and I just insert the handles in the tubes. Holds 3 implements easily as most of mine are long handle type and don't have a big plastic 'handle'. Works well as long as you remember to keep the cart oriented properly when going down steep slopes so they don't slide right out. An el cheapo hook-on bike basket on the back section holds secateurs, gloves & packets of stuff, and is easy to remove for storage. Inside is completely clear for better fitting bags/tubs for prunings, autumn leaves and lawn clippings etc. Easier to lift them out too as I find tubs easier to manage than bags if I'm going to empty them into the compost. I do harvest autumn leaves from street trees for mulch and compost, and this set up is very effective for that. The rack imo is overkill and not really needed. But you do you.

There's free roaming shopping carts all around my suburb... Just saying, they're well built and easy to repurpose.