The back bumper ball hitch is considered to be a class 1. Which if memory serves me correct will do upto 250 lbs tounge Weight and 2500 lbs gross towing weight. As long as the JetSki is below that weight you should be good.
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I love these trucks !!
I have had an 84 and 89 Pickup X-cab P/U also assorted 2 Dr Blazers.
I now own a 97 4 Dr.
I love these trucks !!