Once you go permanente no more vehicles from NOB.
Buy Mexican. Try San Carlos area for resales. Or, if you are really a Mexican now, drive it across the border without stopping at the import/immigration office and pretend you are headed for Guaymas. Then take the old road south out of town and avoid the last import station out on highway 200. From there head on south.
By the time your motor home sits near the ocean for ten years there will be nothing left to drive back north. Once it is parked you will never be questioned, or a small mordita will make it disappear.