I have a fleet of around 25-- 6000lb capacity 48 volt units, and the performance parameters are faster than the 36 volt stuff. 36 volt batteries tend to have a longer discharge cycle, (more plate surface area and less cell wall) than a 48 volt, but I have not seen any negative effects from using good condition 48 volts. If you want longer run times- go 36 volt. If you want increased hydraulic and travel performance, go 48 volt. Most operators prefer 48 volt.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.