Do you think it would be reasonable to maybe just slide him behind the police vehicle? I feel like that would be less interruption in compression. Lifting him onto the gurney and lifting the gurney into the ambulance would be interruption. The back of the ambulance is a pretty small place to be working an arrest. Pro side of course is getting away from worked up bystanders.I think I'd stay on scene but it would be in the back of the ambulance. Working arrests in the middle of the street is making things more difficult than it has to be for any scene. I would do my very best to minimize breaks in compressions for sure and if the Lucas was available (I believe it was) I'd try to get on it before any movement.
I've worked a couple of arrests on the side of the street and feel like they went pretty well short of lack of shade.