We are looking for recommendations for a good battery in our DumpKing trailers. They are each electric/hydraulic. We have recharging units in the box so that they can be charged up when they are parked at the store. We have not found a satisfactory long life battery. What have you found that works? These trailers are used as "free" delivery units for customers when they purchases landscape materials from the store, so the trailers do get a bit of abuse.