Rules about overnighting in rest stops vary from state to state. Some states: not at all. Other states: time limit.
New Mexico says 24 hours max. At least for this rest stop just west of Las Cruces. But, you know, $100 is less than many hotel rooms. And none of them have 40-foot roadrunners made from recycled tires, sneakers, keyboards, ironing boards, crutches... If only there were an equally huge coyote to go with it.