New at this elec golf cart ownership. Have a 91 36 volt club car with very weak batteries. Going to replace with new and put a 3 or 6 inch lift kit and off road tires. Plan is to use this in fields and woods with a couple airline pet carriers on them with beagles in them. This would be used just to travel form one area of cover to another to run my dogs. Some Inclines or slopes from time to time but none greater than what you might see on a golf course but a little rougher trails. No illusions here I know its not a four wheeler. Will going from 18" wheels to 20" hurt my torque very much? What is reasonable life span per charge expectation? All and any advice is welcome. I actuality have two of these.
One to put to use right away and the other to play with voltage increase and body change . Have been told these motors can be run on 48 volt also. has a wiper style controller and actual coils instead of solenoids . not sure what all needs to be changed. I'm sure wiring up grade . 

Thank you for any advice..