Thank you all. After a little digging, here is a little update. Contacted RoadMaster and was told by a tech that the InvisaBrake system turns itself off or releases the brakes 15 seconds after the exhaust brake has been applied. Could also reduce the braking pressure but still not real fuzzy and warm about that though. Then contacted Cummins and was told that you can go through the computer into the exhaust system and reprogram the brake lights to not activate when the exhaust brakes are applied. Must be done by a certified cummins center/mechanic or will void the warranty.
LT. Dan and Gary, you guys were right on the money. Better than having to buy a whole new system.