Quick Q's: Is there any limitations preventing you from using NVRAM or sometype of Flash ROM chip that you can write to 100's of times? ROM is more dependable than RAM especialy if it is volatile. You don't want to be doing XXXmph miles on the highway and then your RAM to clear :).... Not good especially stopin' and steerin' that bitch.... Another thing you might want to consider is that I believe some types of RAM doesn't work well in sub-zero temperatures. Make sure the company that is selling it has taken this into account.