thanks, shipping to US is no issue, easy done from Germany. Mac mini is not temperature resistant, shock resistant, too expensive, humidity resistant, would overheat when hidden and you still need expensive power supply to make it running from car batery without destroying it.
Bluetooth is for 9€ option (see lower part) wifi also 9€.
Car PCs are expensive because they are reliable. It also alives over a three weeks in standby (<4s to go to windows) on 42Ah car battery when not recharged.