hook ur propane tank to it.
why not convert it to solar instead apparently it is quite simple to do
The hills that gasoline engine will.
For what it would take to convert plus the hills that gasoline engine will.
The electric for what it would take to convert plus the electric for what it you can buy new electric for.
Sell the cart you have and use the money to buy an electric cart. Even if you have to kick in money out of your own pocket it will cost less than converting the cart you have now. You will also have something that is designed and tested by professional engineers so it will be more reliable than anything you can make yourself.