I have quite a few dealers. Some gear to more specific kits. Fluft will be handling the Tacoma kits. Just like AMS handles the EVO stuff, ECS handles the C5 Vette kits, Lucas handles the DSM kits, Detroit turbo handles the SY/TY. Johns Performance, G-Body,NE Turbo handle the Buick/TTA kits, etc...
The tuning issues is the reason they get involved. Its hard enough to keep up with the Buick tuning, let alone deal with all the other computers and theyre ways around them. Let somebody that knows the vehicle handle the tuning.
I'm missing a few dealers, the above is just an example.
HTH