I do a few things;<br><br>1) Don't transport any *open* containers. Drink them, and then toss them. Closed/Sealed containers are perfectly legal.<br>2) Remove the keys from the ignition when drinking in the rear. In some states, even if the keys are in the ignition you are considered "driving" even if the motor is off. You may want to remove them from yourself too... as your physical possession of the keys may also be considered "driving" to some police. Go hang them up in the van.<br>3) NEVER give permission to the police to search your vehicle. In fact, outright (but peacefully) disallow it even if they do begin to search. Say nothing more until a lawyer is present.<br><br>Contact your DMV and Insurance companies. Ask them how to classify your vehicle as an 'RV' instead of a 'car/van'. If they classify it as an RV, then so must the police. Doing a quick google search I hear that your van must have a bed, a galley, and a bathroom and you can re-classify it as an RV, but you are best to check with your own state's DMV.