It will take longer to receive your documents if you are outside of the United States
how do I register a truck I bring in from Mexico?
You would have to read the instructions for how to register an imported vehicle.  I can link you to those instructions.
why did I get a ticket for no NY registration if the cop had no way of knowing if I lived in NY or just passing by?  I did rent in nyc by the way but had only been there 4 months