Hi,
Not sure of what the different options are, but it is always a pity that you are not able to better utilise what you already have. Hopefully you can get dealer support to make the existing equipment more functional.
Alternatively, Combilift has a number of equipment types suitable for cold stores. The cold store spec Aislemaster is very useful both inside the cold store and outside if needed and is specifically designed for narrow aisles.
Hope you get sorted.