A grocery store next to an oasis

It is a place for those traveling in the desert. They can tell you the way or send you a letter instead. They usually sell things for travelers, and when things fall off, they go horses to the village and buy things. It is made by remodeling trucks and wagons, and when moving, it moves by dragging, or by repairing the engine unit and moving by power.
* The engine unit is old, and once it is used, it does not work well because of a big breakdown.
※I am embarrassed this time because it was a picture that I drew a long time ago:)