your (possible) cross country trip in a deceased parents car won't be the same as mine was. (I had to do it in a prius
)
But I will share a few of my thoughts that jump to mind . . .
It will be an emotional trip. It was his last car. You will have a lot of hours for your mind to wander and reminisce. It could be a therapeutic trip. It could be a blast! If the car has been sitting still for all these months, it could also be a heck of an adventure and nightmare.
My trip with my mother's car was done partially out of necessity, I had to deal with her car, I also had to transport boxes and boxes of data and records back east. these boxes for her estate were too valuable to trust to UPS or Fed EX.
the Jag might be worth more being sold where it is than selling it back east. Might not be the same as my mom's prius, but according to quick autotrader search's the prius was worth 3-4K more in Washington than it was in NJ. It would have been smarter to sell the car in Washington, but it was easier to use it to bring stuff back east.