Laying down. But I have a feeling it might work standing up with the trunk separator removed. I'm not motivated enough to take out the kid's car seats to try it though.Two bikes standing up? If so that could be something in the possibility bucket. The picture below isn't our car but basically what we do on our road trips with two bikes.
However primary road trip car (Our Rav4) really can't be electric due to it's need. My car however could easily be electric, especially with the free charger at the end of our street...
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We've gone to Vermont with ours. I can't remember if it was 2 or 3 stops for charging. And one there we stayed with a relative that has an outlet for their RV that we plug into to charge.
Even though it takes longer, I actually prefer that drive with the model y. We can can get there with no gas stops in the van, but driving the Tesla leaves me less exhausted.