Whether we use helmets or not use helmets, the core issue is personal responsibility. Charles Darwin had a theory about survival of the fittest, and I doubt if that theory applies only to the physical aspect of evolution. I see ads for UTVs and ATVs with wild speeds and maneuvers in deserts and forests. Trail riding like that might suggest a helmet might be a good idea. Yet, no helmet or seat belt, or any safety system for that matter, can protect anyone from irresponsible actions. Hit a tree or bury the front end in a gully at speed, and it just isn't going to end well.
i have a kaw mule...............use it around house for hauling, plowing snow, etc.............but my mule is a 600..............no speed demon...............has been reliable (purchased 9 yrs ago), but with limited top speed, don't think it would be my choice for 10 miles drives.....agree with KLM, be ready to drop some cash, dealer access is extremely important (to me), and nothing you can buy at lowes, tractor supply, etc................good luck