Kubota B8200, then a Kubota L3130 HST, now a Kubota L3400 HST
I recall a thread about carrying logging chain, and I just finished a small mod so I could carry some chain. One side is for short chains, the other side with the bin carries some 20' lengths. The extra weight is a benefit.
You can also buy removable caps and use in the round tube where your loader mounts. You need a sleeve of 4 inch pipe notched to work as a bushing and then use the removable cap to plug the big round tube on our loader mounts. This will hold a 12 foot long chain and one could also be used as tool storage. I bought my caps at HD in the plumping section. They are the ones with a large wingnut to tighten them down