Update 3/5
I suspected that the rear tire had a slow leak the night before, and that was confirmed when I woke up and peeked out of the tent this morning. A small piece of wire from a piece of a steel-belted tire had penetrated our tire, so we replaced the tube. A great way to start the morning. We finally departed at 10:30 AM and were soon faced with a fairly strong wind which varied from a cross-wind to a slight head-wind. We arrived in Las Cruces at about 4:30 PM, but we were unable to make contact with the Warm Showers host we were expecting to stay with. We decided to keep on going south toward El Paso, but we soon found out there were no RV parks, campgrounds, or motels to speak of between Las Cruces and El Paso. It was getting dark, so we stopped at a mini-mart in Mesilla, NM, to get something to eat. The owner asked how we were doing and we told him. After we explained our situation, he invited us to stay at his house on the screened-in porch, and we accepted without hesitation. Our 67-mile ride for the day ended in Mesilla at the house of a Good Samaritan who allowed us to use his bathroom and shower. The weather was mild, and we went off to sleep in our sleeping bags on the porch right away.