I put my chain box (ammo can) on the ROPS (still haven't painted the one for the chain). I just used ammo cans and some brackets that I made to fit existing holes in the ROPS just above the fender on the lower section on both sides. Not sure what they were intended for, but apparently was for me to bolt on a couple ammo boxes. I keep some very basic tools and a rag for working attachments on the left side(the orange one), and a 20 foot 3/8" chain on the right. I still need to consider a carry-all because I'm usually doing something that requires shovel, axe, pickaxe, hammer, wedges, rake, pitchfork, hoe, weedeater, etc etc etc when I go out on the tractor. BUT, I don't have room in my shed to store it, meaning I'd have to unload it every task/project. Still better than walking back to the shed because I need that one-more-tool and then not having enough room to carry everything back. Most times, I just use a little homemade trailer I built, which serves very well, but isn't capable of carrying much more than about 500 pounds. It was designed to pull behind my riding mower (pre LX2610SU) so wasn't much point in making it heavier.
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This was taken just after I finished the installation of the Summit 3FV kit for the grapple. The shop is a complete mess at the moment awaiting fairer weather for a good cleaning. I used the ammo cans from Harbor Freight, and already had one hinge failure (on the orange one). The spot welds for the hinge on the lid popped loose. No biggie. I just drilled each of the spot welds, then closed them back up with a wire welder, and voila! That hinge ain't coming off again. I like the detachable lids on the ammo boxes. I take the lid off the green one, pull one end of the chain out and drop it. It rattles a bit coming out, but between the fat tires and the inertia of the chain coming out, it doesn't touch the fender.