If what you have mostly found have the battery positioned parallel to the, except for units that come from China or Europe, that should give you a clue as to what type of product support (parts, service, rentals) you can expect to receive or not receive to keep you up and running.

What size clear working aisle (i.e. will the pallets over hang the face of the rack?, do you have or plan to have? Will this unit be confined to work in the aisle or work in loading & unloading operations also? what is the height of the top beam? what type of operating surface do you have? what is the max load weight & size (l x w x h), how many hours a day will the machine be operating?
With this information your audience might have a better idea to offer you solutions - heck the Brits might have a unit that will "turn on a six pence".