Question edited for clarity and spelling of 'manual'.
They appear to have been custom builts and not a genuine Toyota product line. It would depend on what chassis they were put on.
On my slightly more modern Lexus Toyota, it is all done from a single stalk on the lower right side of the steering column below the wiper / washer functions. There is a certain speed you have to be going for it to be operative, something like 35mph.
Press the button in the end to turn it on. Light on dash 'Cruise'.
Push stalk down to maintain the speed you are at.
Pull the stalk towards you to Cancel or touch Foot Brake.
Push stalk up to Resume your previously set speed.
Hope that may help. Or google the truck manual it was made from.
https://www.google.com/search?q=1984+Toyota+Deluxe+Camper
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