Normally I would never discourage anyone from buying an HI kukri, but I think buying or using a knife for intimidation is unwise, and likely unsafe. If you're in your truck anyway, the safest & smartest thing you can do is just drive away - de-escalation is almost always the best choice. If you're worried about someone who's in the truck with you...heck, maybe you should keep your doors locked, and avoid inviting dangerous people on road trips.
If you somehow find yourself in this kind of dangerous situation anyway, I still think having a knife just for "intimidation" is a bad idea. A kukri ain't a lightsabre, but it still requires a certain amount of skill to use properly, especially in a confined environment at a time when you're under a lot of stress & pressure. Trying to intimidate someone with a weapon you don't know how to use is really dangerous - you'll probably just escalate things even further. What's more, having a kukri at hand may give you a certain degree of false confidence, and lead you into a dangerous situation that you could have avoided.