Hello, Pastor John and welcome to Just Answer. My name is James.
I'm going to address this question so that you are not left wondering...in limbo... before your trip. Unfortunately, the warning chime cannot be silenced on your van. I know this is not the answer that you want to hear, but let me explain.
The Roll Stability Control System is a safety feature and an important component for a vehicle that transports this many people. The Anti-lock Brake
module controls the anti roll system by monitoring the throttle position, the yaw rate sensor, the wheel speed sensors, the steering wheel angle and the speed at which the steering wheel is moving to determine if an unsafe event occurs so it can activate it's anti-rollover protocols. If the ABS module detects a failure that will prevent the anti-rollover protection from working, it turns on the warning message and the chime.
Safety, Anti-theft and emissions controls are intentionally designed by the manufacturer so that they cannot be bypassed. The warning chime is actually intended to be annoying to persuade the driver to have the problem addressed. Keep in mind that while driving the van with the warning on, the roll stability system will not be able to operate.
The warning chime itself is built into the instrument cluster and cannot be disabled without making the cluster inoperative, which will then keep the engine
I do wish I had a short term solution for the annoyance of the warning chime, but I did want you to understand WHY there isn't a way around it.
I hope this has been helpful and wish you all the best on your trip.