When do you guys connect / disconnect when traveling?

Agree... there are public parks where they will charge extra if your towed vehicle is not connected to the motorhome when entering. Glacier Nat'l Park is one. We were disconnected and asked to pay extra. There happened to be a big turning around spot just beyond the entrance booth. We told them we'd just turn around which we did. We then hooked up the Jeep and came through again - only one fee. :)

Michigan state parks don't care if you're disconnected or not. The towed vehicle is an extra fee.