Just in case you weren't aware:
Heavy duty trucks and diesel pusher RVs use the J1939 series of protocols. The OBDII protocol is for passenger cars and small trucks. Some code readers can handle both OBDII and J1939 (I have one) and these readers require an adapter to connect to both types of diagnostic connectors. That's what the adapter previously mentioned was designed for. But OBDII and the J1939 series protocols do not communicate with each other.
If your cruise control software is designed to connect to the ECM via the OBDII protocol you are out of luck. But if the software will work on any of the J1939 series of protocols, then that adapter will work.
Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
2012 Jeep Wrangler Unlimited - Rubicon