I can share the limited knowledge I have regarding the OBD port on our RAMs (13 through 17). The OBD connector presents two CAN buses, pin 6 and 14 carry the powertrain high-speed bus, and pins 3 and 11 carry the chassis high-speed bus. The BCM is the gateway module and I suspect the primary bus for the BCM is the chassis bus.
The BlueDriver OBD adapter only has pins 6 and 14 populated, the ODBLink MX has both CAN buses populated.
I don't know what bus AlfaOBD uses to access the various modules on the vehicle's buses but I suspect AlfaOBD uses both buses since module parameter changes are only allowed directly and not through a gateway module. AlfaOBD makes note of this on their home web page and recommends the OBDLink MX which is populated for both CAN buses.
I have both, OBDLink MX and BlueDriver (hands down the best scanner I've owned to date) and AlfaOBD has issues connecting to some modules using the BlueDriver OBD dongle. I switched over to my ODBLink MX and AlfaOBD was able to function as expected.
Hopefully, others can fill in more mysteries of the RAM's network.
