DubaiCars is nice, but i would be amazing in .com. Or in .online from my perspective.
But .us sells very very poorly as extension. There is a huge thread in NamePros in ccTLD section where one can learn more about it.
I would say almost no value in this name - meaning I doubt there will be end user willing to pay a premium to domainer holding this. If end user is from Dubain (car seller), they will definitely not use .us extension. If they arefrom .USA (importers of cars from Dubai? - is there anything like that?), I would say they will also go for some other extension..extension is the problem here imo