When you specified "InCarPC" I thought you were specifying a brand name. I run an in car PC, a HP Thin Client with a 10gb drive and full up XP, not the stock XPE usually used on the Thin Client with a digital drive.
Installed HP T5700 running full XP on a 10 gb HD, Street Atlas 2005, LT-20 GPS, OBD-Diag, rear view camera, FM transmitter.
Ah.. sorry about that. I take for granted that term.
So long as your system can run Java 1.6, and has some sort of comms port, it should work fine!