In the 90's I did the maintence at a golf course and they had some of these National lawn mowers used for slopes and uneven terrain. They are the most user friendly mowers. Very simple old school belt and jack shaft design with 3 articulating reels. Reel mowers are the best type of mower for a "bent" type of turf vs. Fescue turf. If I still had St. Augustine turf, I wouldn't be advertising it, "I" would grab it. No computer, no electric clutch, no hydraulics, and none of the things that make life difficult when it comes to mowers.
Used National Reel Riding Zero Turn Lawn Mower, 16 HP ... - eBay
Used National Reel Riding Zero Turn Lawn Mower, 16 HP ... - eBay