Getting a 100 pound gorked out German Shepard out of a truck is a classic maneuver! I ended up on the bottom last time making sure she didn’t yard sale in the drive. She tried to leap out like she always does and we crashed and burned it was hilarious. Like you I tend to hang with her till the drugs wear off.
She hates the cab of my truck, and wouldn't remotely consider riding in the bed! I picked her up and put her in the back of the Caddy. Getting her out afterwards was quite a feat. Old girl is FAT!