Most of the no tell motels have an arch and a very tight entrance designed so wifes or others driving by can't see into the parking area of the motel. I can't think of one that I've seen that could accommodate even a small RV within its confines.
At least some of the purpose of "no tell motels" in Mexico is so married couples who live in small houses with lots of kids can get away for a little fun in private.
Here's the link.........
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/27603439.cfmThe referenced thread gives GPS 24.029845 -104.614573 which you can Copy & Paste to Google Earth and then use street view to look at the entrance and you can get an idea of the courtyard. You can almost always use Google Earth to look at places
Years ago we also stayed in a motel courtyard listed in the Church book in Bermejillo north of Torreon but that may be off route - MX49 to Chihuahua. It was safe but they had a party which started after we got there. World's worst band playing in the courtyard all night.
Where you spend the night depends on what time you get up and going in the morning and how often you stop along the way to enjoy your surroundings. We are never in a hurry to get anywhere. When you hurry you pass by all kinds of interesting stuff you would never know about if you did not stop to smell the roses - or whatever.