Barb
Do yourself a favor buy a single point watering system with for your battery with a visual indicator (little white dot) that alerts personnel the battery needs water. The few extra bucks will save you money & extend the life of the battery by refilling the battery cells to the proper level. Improper watering of a battery has shorten the life of batteries more than any other cause.

Go with a 48volt system - as Ed pointed out the truck will have faster travel speeds as well as lifting/clamping/tilt speeds. And the last time I checked there is very little difference in price by going to 48v - like less than $100. Plus your lifts motors/electrical/electronic components will see less less current draw (less heat) & live longer save you money in the long run.