The tires you sell and install on any electric vehicle need to provide traction that’s as good or better than what the original equipment tire provides. The same goes for rolling resistance. 

The owners of second-hand electric vehicles (EV) typically have less money and are not as savvy about EV technology as new EV owners. It’s up to you to help them. And that requires some hand-holding.  

If your technicians are not afraid of working on high-voltage systems, they are either extremely well-trained already or very naive.

You as an owner - plus your managers and sales staff - need to embrace the owners of electric and hybrid vehicles. When you do, the customers you take care of will see that you speak their language.