Simple cheapest kit. Limited by your imagination and your expense of battery. I put 4 18v milwakee battery's I'm series. This thing moves a 150 lb steel riding mower frame and the rider with ease into wheelies. I paired it to the 3 speed transmission so gearing can help your cause. The reverse thread nut is the weakest link. Fun can handle move than 48v. Don't exceed the amp limits. Drill battery's will over discharge if you run them empty. Looking to invest in a 52v lithium ebike battery for power and range