Here's how I geared down my gas cart (1998 Club Car) for use at the airport..

(http://www.cartpartsplus.com/machini...5268c3d9c0a 9)

It can crawl really slow and there's no problem with maintaining a slow speed when towing gliders. There's a couple of small rises at our field as well, and it has no problem climbing them. It doesn't go very fast (maybe 10-12 mph), but it's way nicer then having to maintain batteries and chargers.

Food for thought...