Last night we moved along to approaching the car with the back hatch open. Normally the back is where the dogs ride, so I knew it was going to be harder. She did fine, and I gave her treats for looking at or approaching the car. She only stopped taking treats when we stood so close that I was leaning inside the back. I backed up and gave her a ton of treats just for looking at it. She did quite a bit of displacement sniffing, so we will probably stay at the step for a few days.