Just wanted to suggest a future feature:
A Tire Pressure System for deflating and inflating the tires, for better grip in different terrain.
Most of the time its called CTI or CTIS, for Central Tire Inflation (System).
A lot of russian (offroad) trucks have such a system fitted.
Just look at the wheels and wheelhubs.
http://www.autolexicon.net/obr_clanky/cs_ctis_003.jpg
As someone who drives offroad, I know how important tirepressure is.
Here is a pic of high vs low:
http://www.autolexicon.net/obr_clanky/cs_ctis_001.jpg