That's the problem in today's world...the government is so far into regulating everything that a product like this will likely be illegal in most states. Personally I could use this product for giving kids joy rides on normal forest logging roads and never have an issue. You just have to go slow.
I've seen a few videos of parents with their kids in the back of factory made machines designed for that purpose driving like idiots. The crazy drivers are the problem 99% of the time.
On my very first excursion onto a public forest road I ran into a forest ranger going up the hill as I was literally just putting down the hill ~5 mph. I stopped to be friendly and say hello. He was all about telling me to wear a helmet or it would be a $180.00 fine. I was on my way to do some electrical work at my sister's cabin and had the wooden box I made for the back loaded with tools and pvc fittings etc. I thought...gee why don't you go find someone being crazy on the road instead of an old guy in a baseball hat that's just stopping to be friendly. Luckily I did have a helmet in the back so I just put it on and invited him to stop in for a visit sometime at my place. He's just doing his job, but I'm pretty fed up with all the regulations because of the few idiots that cause all the problems.