There is no “CAN Binding” available (if you are asking this)
This will be a challenge, since you will have to:
a) Find a way to physically interface to the CAN Bus using a device like the PiCAN or a USB2CAN interface and your rPi
b) Use software on the rPi that can read and write info from/to the CAN Bus (like Python-CAN)
c) Define a way to pull this info into openHAB (e.g. use MQTT or REST API between the Python-CAN and OH2)
d) If you reach point (c) above, you can then enable all the other goodies (like Voice control, remote control, etc)
You can definitely do all of the above, it just takes time and alot of digging, testing, debugging, etc.
There is another option of course: Introducing BountySource for funded development
Ps: don’t worry about the other stuff for now 
Rich & Vincent are just hijacking the thread (
joking) to discuss a possible solution that uses dynamically updated geo-location info (since the RV is moving) to update some other parameters within OH2.
Ps2: I found also: PiCAN2 - Duo CAN-Bus Board for Raspberry Pi 2 With SMPS with alot of nice docs