You don't need a dealer. He sells direct and has a special deal right now. Teth Air on SW. I just took mine off my 2012 to put on the 13 coming. You will love the tetherless tether, I did.
Can you set the distance they kill the engine at? in the case where your pinned under your sled and your within the distance that it allows you engine to run i would not want it.
And about the distance. Yes the receiver antena length is to be shortened to shorten distance. Although this is true, we have found the most reliable antenna length to be 2cm (3/4") If you want it to shut off really close, simple cover the transmitter tag completely.
We usually ship Express post as it is not too expensive, has insurance and is trackable. We usually ship next business day after the payment is received. A week is normal but we can air ship for the next day if you really want to pay for it.