This is exactly how I do it...
Bizarre to think of, but my bass fits in the front passenger seat that way, and I have 2/3 of the rear seat and the whole trunk free for other gear. Or a passenger can ride in the rear seat, behind the driver's seat.
All of this reminds me of a vignette from the bad old days. Did a jazz trio fundraiser back in the early '80's for some politico. Drums, piano, bass. Dug the piano player; she was beautiful, sweet, smart, and musical.
We were both broke, living in The Valley (L.A. area). I was driving my '64 Dart, with the driver's side doors (both front and rear) that wouldn't open (entry and exit through the windows, only).
Post gig relaxation, driving home, talking, sunset. The bass was in the front passenger, the comely pianist was behind me, gear crammed in the rest of the car. We were up in one of the canyons, and stopped to look at the sunset. Things were feeling sort of sweet and romantic.
A CHP pulls up behind us, lights on. He sees my sh*tbox Dart, stopped on the side of the road, makes us out to be trouble. Cop walks up to us, says, "Get out of the car." The piano player and I both start hoisting ourselves out of the window openings. The cop is aghast, angry, and incredulous, "I SAID TO Get OUT OF THE CAR!" Me, "We're trying."
I pop the trunk. He sees the amp, etc. Stares at us, hard, for a minute. Turns without a word, walks back to his cruiser, and drives off, shaking his head. Sort of broke the whole romantic, sunset, boy/girl thing. We climbed back in through our respective windows, and drove home without talking much. Things just weren't the same with her, after that...