Conventional wisdom says that after hookup, the ball should be about 19" above the ground. Since the tow vehicle will squat to some degree when you drop the hitch weight on the ball, the ball must start a bit higher than 19". For your Suburban, a quick guess for the amount squat would be an inch or two. Your WDH will remove some of the squat, so you are back pretty close to 19".
Of course if you add a lift kit later, the ball must be moved higher to maintain level.
Hope this helps
Bill
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