Lew will sell you an inTune and his custom tune as a package deal. Lots of "old" Predators out there.
As far as Mustang... it might be the type of dyno (as in brand name) they use. I had my previous truck tuned on a Mustang dyno. Has nothing to do with Ford Mustangs.
Any tuner should be able to tune any vehicle if they know what they're doing. Trucks are common... Ford, Dodge and Chevy guys have been tuning their trucks for over a decade. A Camaro, Corvette, G8, GTO, Silverado, Tahoe, Escalade... they all are pretty similar. A decent tuner should know the difference and be able to tune them all.
Just because you're frustrated doesn't mean we want to see your language on this forum. You'll eventually find someone that can do it, if not with a Predator then a custom vehicle tune using EFIlive or something similar.
NBS 2007 Chevy Silverado Texas Edition Crew Cab, 5.3, 3.42 gears. 87 octane Diablo tune.