New guy with a question

[CampyRoyallSierra]

Hi, New to forum. I have a 1977 GMC Royal Sierra that was ordered from the factory with the trailer package. It was bought new by my Dad. I already know Royal Sierra's are scarce. I am curious how many trailer special trucks where ordered. It is a 1/2 ton with the bigger brakes, trailer hitch and a 454 under the hood. I can't find much information on the trailer special package. I will post pictures later. My Dad used it to pull his camping trailer. Us boys loved driving the truck as kids.

[txab]

Welcome