Your trailer's hitch height is 17 3/4", according to the specs in the owner's manual.
The top of ball height, as a rule of thumb, should be ~1 higher, so ~18 3/4". But that can vary with tow vehicles suspension, (softer=higher stiff=lower).
add edit: if you changed the trailer tires to a different size, then you should add half the difference of the diameter of the old and new tires to the ball height. It's probably not enough difference to worry about.
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Alan
2014 Silverado LTZ 1500 Crew Cab 5.3L maximum trailering package
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