I would return the call and see what he has to say. Don't offer up anything unless he asks. If he asks, you will then know what you need to do in the way of packing his stuff up.
As for two vehicles being driven to Mexico...couldn't he use a tow bar and hook it to the back of the camper and tow the second vehicle?
You won't know what he wants until you call him back. Mind reading is going to drive you nuts...call him this evening or tomorrow so that you can get your anxiety and mind reading under control.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
