EPA papers would only be needed if you are importing permanently. Temp import requirements are the same as most countries, must meet rules of where it is registered.
Insurance is required in most states, easy to get on line. Might need an address to send to so if you are on the road maybe find someone just across the border. You could use mine (send PM) and I could scan an email what you might need.
Remember when you cross out of Mexico most vehicles from US do not have temp import (free states along boarder) so they will not be stopping at custom to get checked out. This took me about two hour to find the right place to get temp checked out. If you used a credit card for deposit you will not need bank mentioned above.
If you make it to the northwest drop me a line.
Bob
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