As usual, some good advice and some real carp. First thing about the car is: How far are you moving them?
Warm them up in the car. Leave them to settle down, cool down and cluster at the destination, in the car, or anywhere you choose. Simple, really.
The “branch trick” works if done properly and at the right time in the right circumstances. You need to think about it and some clearly don’t.
The earlier part mentioned 3 miles. The reason for that is if they usually forage within about a mile, so moving them more than twice that distance usually avoids bees foraging at a previous site and taking the ‘wrong’ route back to the hive (and finishing up on the old site). As always, there are exceptions to the rule.
One can, of course, move a hive less than three feet and lose all the foragers. But only if the job is not thought about beforehand, by those who doesn’t think of the outcome of their actions.