Batteries are heavy and cost a lot of money. The weight is important because a heavier car use more power which require more battery to get the same range. So you can not just double the battery size of a 150 mile car, you need to more then double it. That makes the car quite heavy in the end which limits the cargo capacity and it might need to be classified in a heavier class, etc. You therefore end up with a big heavy car that costs a lot of money. You might be interested in it but most people are not. So it would not sell very well.
I have taken 500 mile trips in EV cars a number of times. This is however not such a big issue as you might imagine it. I do not know about Pennsylvania but generally fast chargers are frequent enough that you can stop anywhere you want to charge. If you do not want to stop at one fast charger you can easily drive to the next one or the next one after that. Look for fast chargers that are near a restaurant or shopping mall. You can start charging your car, go and get some lunch, and by the time you get back to the car it is charged enough to drive another few hours. For your trip I would plan two stops of about 10-15 minutes each. This gives you time to eat lunch and get some snack, as well as some rest on your trip.
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