the higher the voltage the higher the amp draw. The higher the amp draw the higher the heat & the higher the owners electrical bill to run the charger. Heat is an enemy of electronic or electrical components - like motor controllers and motor brushes. 48 v is very commonly seen in forklifts in most countries around the world and 72 volt 7 80 v electrical system are no8 uncommon especially in the European market in larger capacity lift 8K & above. Today 24 volt systems in 3 wheel forklifts are just about non existent. The first three wheel units introduced to the US market were by Clark & they all had 24 v. Soon competition copied them with 24 v models. When folks started introducing higher volt units in the US market in 3 wheel models users were slow to change over - US folks like to do like waste money on energy consumption but taht is changing. My son an electrician is installing more 960 volt systems in buildings (new buildings and some retros). Europe is moving goi towards 1080 v for in plant use.