The one mystery that hasn’t been answered to my knowledge is why didn’t Pence want to get into the car with Secret Service?
He knew they would whisk him off to a “secure location” and he wouldn’t be able to certify the election. A big part of the Trump plan was for Pence to refuse to certify the election and throw the process into chaos. When he refused to do that they came up with a plan to physically remove him instead. Luckily he was smart enough to see through it.
He knew they were going to kill him. Ultimately there would be no other way around it.
Or he suspected they would kidnap him until he declared Trump the winner of the election.