[63corvette]

From experience you can do it either way but the electronic is much easier.
Depending on the track and where they park the trailer it can be a hassle to do it at the track.
Drivers prior to the Phoenix race were told they could not park unless they had the electronic credentials.
It was just a threat as no one even looked at the credentials until you left and came back into the track.
The one time I left they wanted to stamp my hand then upon return they wanted to scan the ticket but the scanner batteries were dead. I asked what the hand stamp was for. I got a deer in the headlights look and then a request to scan the ticket when the scanner did not work they just sent us on in.
The people guarding the staging lanes when you went to run did not have a clue what they were looking at when the crew member tried to get into the lanes with the electronic credential.
It should get easier as time goes by.
My 2 Cents