Welcome to the forums.
As far as placing any additional weight on the back of your Ambassador, DON'T DO IT!!! The late 1970's rear-bath coaches are highly prone to frame separation, and rear end sag. Anything you put on the back will only make matters worse.
A forum search of "rear end sag" and "frame separation" will tell you in greater detail about this issue.
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Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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