To get out and remove and stow any pads and ramps they might have been using?
Similarly, if I am not using my mover to bring my caravan to my car, I run my car to my van, and then might need to allow time for my wife to do the light and pitch checks and collect any plank, plus get in the car. I do like to allow the car's CPU the short period it needs to come off fast idle before trying to precision reverse, it's an auto.
If situations are right, I will pull forward and switch off and we do these tasks together, all depends on the circumstance we face.
I expect with the tasks we as caravanners face a bit of idling about can't be practically avoided.