Spoilage is an issue we all hate to deal with. We had used a roller grill for a while, but we made them and they sat there and turned into beef jerkey
Now we just heat them in the microwave, no spoilage...and they are even fresher than sitting on a grill for a while.
While you're at it, don't forget the other menu items you can add:
Cheese Dog-use your nacho sauce
Jalapeno Dog- Top a hot dog with jalapeno peppers
If you use gehls cheese and their dispenser, they also have a chili sauce, they have a dual dispenser, you could add chili dogs, chili-cheese dogs, and chili cheese nachos...