here is a reply to a similar question from etrailer.com
Expert Reply:
The limiting factor is the capacity of your hitch. Using a 1-1/4 inch extender will reduce your hitch overall capacity by half. Your hitch has a 200 pound maximum tongue weight, so by using the extender you will be limiting your capacity to 100 pounds.
Tongue weight is the weight of the bike rack, the extender (if used), and any load in the vehicle behind the rear axle, plus the bikes on the rack. You can see that, when using an extender, you will be significantly limited to the amount of weight on the bike rack.
My thoughts: This begs the question of the size of your hitch 1.25 or 2 inch. It sounds like it may be a 1.25 inch. Still with a tongue weight of 2oo lbs., reduced to 1oo lbs. via an extension, that should easily support an ST-2 with the battery removed, I would think. And, the USA made rack I mentioned earlier weighs just a little more than 1/2 of he Kuat rack. I am planning on installing a 2" hitch and hope that I will not have to use an extension for the rack I am looking at which has a 30 or 60 day return policy (cannot remember which). I like your vehicle and hope you can make something work for yourself.
Some on the forum have suggested a DIY rack if you can fit the bike into your vehicle after removing the front wheel and seat (or possibly just lowering the seat). There are merits to both approaches, dependent upon one's needs I think...