I have a Salsa Fargo converted to an E-Bike and running a very old (+8 years) and now noisy BBSHD with a newer 52v battery. The set up weighs about 55 lbs and is relatively easy to put on a rack for exploration rides. The problem is either it is getting tired or I am getting old (78). Grinding up steep fire roads are a little more difficult each year. I am considering replacing the BBSHD and battery with something that has a little more power. I understand there is/are options to go to 72volt set ups but not sure what to buy or where. Looking for some advice/guidance.