Yeah Lou, it works fantastic. I don't want to hijack this thread with it, so I'll just place this one last post about it, but anyone can feel free to email me with any further questions.
They are called grill-dogs. You can get it in one of three versions. The basic one is just the roller and stands (which all 3 versions have). You will hook it up to an electric rotisserie you may already have for your existing grill.
The second one comes with the electric rotisserie motor, that you mount onto your grill and plug into an ac outlet. Many larger grills come from the factory with pre-drilled holes on one side to accept the mounting of a rotisserie motor to the grill. If your grill already has these holes, you just mount the bracket and rotisserie motor to it with included hardware.
The third version (which I have and you see in the picture) comes with a rechargeable battery powered rotisserie. Once you have the batteries charged (it comes with an ac charger), then you can use it for many hours. These work great at campouts where you may or may not have easy access to an electrical outlet.
All of the rollers come with an adaptor that lets you join together two sets of rollers in tandem, that can be run off one rotisserie motor (which you saw in my pic). I can cook 24 hot dogs at the same time this way. The great thing is, you don't have to stand over them and make sure they don't burn. They just slowly roll and plump up. The only thing I have encountered is the smaller hot dogs don't like to turn to begin with (or if they are real square). Usually as they heat up and plump out some, then the problem takes care of itself. Using bigger dogs like Ball Parks brand also takes care of this.
I got a pair of the battery powered new ones off ebay for less than $40 per.
Here is the website for them:
Grill Dog - Stainless Steel Rotisserie Grill Acces
The portable grill I originally talked about is just wide enough to place two of the grill dogs on it. (as you can see in the pic). I had to turn the grill dogs rollers legs/feet inwards to make it fit. I also built the little L bracket you see attached to the side of the grill that holds the battery powered rotisserie motors bracket....since this grill didn't have any kind of pre-made stuff to accept a rotisserie.