Could I bring a vehicle without a license plate on it? Its strictly a trail rig so never got a plate for it

Yes you can bring that. Lots of people have dedicated trail rigs and tow them up.

Yes you can bring on untag vehicles

Yes you can bring un registered vehicles on a trailer. You park your trailer and tow vehicle in the parking lot in front of the main office.

Yes, its permitted.

Yes you can. I take a Jeep trail rig there a lot.