Another alternative is the Bauer RV lock. We bought one, it died within a couple of days & they sent me a new one. It's worked fine for the last 4 years or so. When I researched brands it seems like they all have issues with the odd one dying early, but if they make it past the first few months, they're good for the long haul.
I'm not big on technology for its own sake, but we have the kids, inlaws and grand kids that come camping with us & it was a nightmare trying to keep up with the keys. An electronic lock was the perfect solution.