Indicating Capacity of Fixed Asset

My customer has a lot of storage tanks they want to load into Fixed Assets. They want to indicate the capacity, but not include it in the description. I am thinking entering it in a DFF, but they would like the information to be more available than it would be in a DFF.  Does anyone have any thoughts on the best way to handle this? They are using STL depreciation so there is nothing unique about the tanks themselves other than some are huge.

Thanks for your ideas.

Bob