The payload capacity can vary, but most of the half-ton pickups can tow up to 8,000 pounds. The three-quarter ton series three pickups can tow up to 12,000 pounds.
The weight of a 1979 Chevy Silverado camper special with a 400 tyranny is about 3,342 lbs. In the years 1973-1979 the truck weight did not change.
The 1979 Chevrolet C 20 camper special as a maximum towing capacity rating of 7500 pounds. The manufacturer recommended not exceeding 7500 pounds.
I have a 1979 gmc camper special with a fairly heavy nine and a half foot camper on it. I get 10 miles to the gallon maybe 11 with a tail wind.
The Dick Emery Special - 1979 TV is rated/received certificates of: UK:12 (DVD rating)
To the Manor Born - 1979 Christmas Special The First Noel 1-8 is rated/received certificates of: Australia:G UK:U (video rating) (2000)
That Sinking Feeling - 1979 is rated/received certificates of: UK:A (original rating) UK:12 (re-rating) UK:PG (video rating) USA:PG
Most likely a Chev 350.
The Music Machine - 1979 is rated/received certificates of: UK:A (original rating) UK:PG (video rating)
That's Carry On - 1979 is rated/received certificates of: UK:A (original rating) UK:PG (video rating)
Porridge - 1979 is rated/received certificates of: Australia:G Finland:S Iceland:L UK:A (original rating) UK:PG (tv rating) UK:PG (video rating) (1986) (2000)
The American Game - 1979 is rated/received certificates of: USA:R (original rating) USA:PG (re-rating on appeal)
The Tempest - 1979 is rated/received certificates of: Australia:M UK:AA (original rating) UK:15 (video rating) USA:R