Hey @Pinger, what year is your 'burb again? If it's a '98+ then the PCM is supported by HPTuners. For '96-'97 black box PCMs I believe the go-to software is TunerCat, also known as JET Dynamic Spectrum Tuner. Just wanted to give you some other tuning software options to check out if you can't get TunerPro working with your truck.
If you're only wanting to do factory diagnostic/maintenance procedures then Chinese Tech 2 scan tool clones are available for $2-300 US, or you can emulate one on a PC with software called Tech2Win.
If you're only wanting to do factory diagnostic/maintenance procedures then Chinese Tech 2 scan tool clones are available for $2-300 US, or you can emulate one on a PC with software called Tech2Win.