Gracie is my girlfriend cat. She is the strongest, survivor-type animal I've ever owned (okay, been owned by). When we brought her home in the car, she slipped out of the box (okay, it had no top on it, go figure) and under the front seat; when my husband turned on the motor, the adjusting seat nearly made her into a shrinky-dink cat.
That was nearly six years ago and she still will not go willingly into a vehicle, period. What has saved my sanity is the wonderful vet van that comes right to the front door and if I'm having a lucky day I can grab her before she figures it out and voila! In and out, checkups and boosters done!
Gracie's upside is that she is like a purring teddy bear with claws. She enjoys surfing on the sheets while I'm changing them, and can she hunker down and hold on! Brush her, nuzzle her, kiss her on the noggin, but don't expect her to go in a crate. And try not to disturb her from her perch on my occasional chairs, more recently become Gracie's monkey bars and cat scratching pads. Are there counselors for people like me?