The real problem you're going to run into selling him is that when prospective buyers come to look at him, they're going to want to see him ridden over fences.
If I called in response to an ad about a horse and the owner couldn't show me the horse under saddle or over fences or provide a rider who could, I wouldn't go look at the horse. I would never put a rider of mine on a strange horse without seeing it go first.
I know you're not asking a lot of money for this horse, but given the market, I think you're going to have to find a rider to school him over fences a little, get a video or a still shot of it for the ad, and have someone available to show him to prospective buyers.
As far as the first video, what I saw was a horse with a wonderful, rhymthic, balanced canter, but a trot where he doesn't move out from the shoulder particularly well. The video also makes him seem sweet, easy and laid back.
The second video is better, but it's just not enough for a prospective buyer to get an idea of his ability.
If you're going to longe or free longe over fences, construct a decent size fence and make sure you use ground lines appropriately.