Hi and Welcome to the chapter, and thanks for your service.
all I did was bring in copies of my orders military id, proof of insurance and the registration for both vehicles ,and since we no longer have any smog checks you should be good to go. As to the ID , you will need two forms of ID , your current Military ID, birth certificate , insurance card, S.S. card...military DD's, old drivers license... should do it for you
IMO I would go to a location close to military base , so that they are familer with Military exceptions .
Glad to have you back.
On Edit, and weight slip for the trailer..