Between the skid and the exhaust, IF only one would work, I'd take the exhaust. One of the Sedonafest participants partially smashed his this past weekend, nowhere near as flat as others I'd seen at the Toyota event in Vegas at SEMA 2006 when they were letting everyone drive them on the obstacle course, and he reported he couldnt go faster than 60mph on the way back to camp. If you want to make it work I'd be happy to work with you on it so we will know exactly what is required to fit it correctly.
If anyone else in the SoCal area has a TT model, and want to bring the truck in, we'd be happy to take a closer look & see if the adaptation is easy enough & install it for you.
Terry
All Pro