The Draw-Tite and Hidden Hitch Class III hitches we offer for your 2009 Mercury Mariner have tongue weight (TW) ratings of 525-lbs. Both of these are sister brands to Reese.
The Ultra-Fab Motorcycle Carrier # UF48-979033 itself weighs about 50-lbs. This means that if your hitch has a 525-lb TW capacity then after you account for the weight of the carrier it will have a remaining capacity of about 475-lbs. Your hitch will have a safety sticker that indicates its TW rating, as will your... view full answer...