Just let me know where dinner is and I will handle the left over wine so you don't have to transport it :B We carry open containers in the house part of the MH all the time. I don't think an officer is going to be comfortable with having an open container near the driver or passenger seats but in the back I doubt there will be a problem.
I have been on many trips where the passengers are quit buzzed when we reach our destination and entered the coach sober. Always keep it in the back and always have two sober drivers in case of emergency.