Hi,
As you mention in your request. We have a ready platform that we can adapt to your requirments.
It's based on:
ATMEGA328P,
SIM900,
UBLOX.
2 external antenna (GSM, GPS). Why external ? For increasing the signal especially in weak region.
Input voltage 12V/36V. So can use on both cars and trucks.
Also we can provide board with many sensors, such as Battery level sensor, accelerom......
Please provide your mail box, for receiving full data.
Regards.