Yeah thats what I would say.
NXT gets K/O'd in almost every aspect by M16 IMO. It is a much much much better wax.
I do know that white Tundras are painted with imron, which is a tough paint finish, although for some reason very susceptible to fading.
I'd do a polish to make sure the surface is clean, then 1-2 layers of M16. Should blow you away.