large frame ic pneumatics, mitsu cat and nissan, are built at mcfa in houston (like these 2)
small frame ic mitsu, cat , and nissan are built by nissan where ever they get built
same trucks ive seen the nissans at houston myself

the only difference is who will give you a better price
mitsu support is very good after the fact
the nissan dealer in my area has dropped the ball somewhat now we service platnium trucks where they slacked
you would have to research youre local dealers
i believe nueaman hobbs*?? is the mitsu dealer in az