I wouldn't worry about it. You could find discussions about de-rating the towing capacity of a trailer hitch due to extending it, but 3 inches is below the noise level. If you are talking 12 to 24 inches, you might want to de-rate it and compare the de-rated capacity to your Jeep weight. The height of the ball would not effect the capacity much either...even less than the length of the hitch.
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2004 Tiffin Allegro 27.5 ft. P32 18,000 lb. GVW. 8.1 liter. Workhorse chassis built May 2002. 35,500 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.
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