Let me know if i can help. I had the same question and based on the little bit of research i did it did appear to be a US spec truck but don't take my word for it.
looks like a decent rig to me. Unfortunately I'm out of town thru late next week so wouldn't be able to look in person until then. I'd ask for pics of the undercarriage and engine bay prior to making a trip up. Custom cage looks good and safe and obviously isn't stock. I'd make sure that...