I'd try to find an independent shop with good reviews. How long have you had this truck? Most likely it has a self adjusting clutch that is worn. It definitely came from the factory with a self adjuster
Ooh about 6 years. I have 2 dealers and 4 shops at home, I've been using for the past 20 years or so.
I've had a clutch or 2 replaced over the years. But I've never had a problem with the clutch brake.