If you have a 2008 Sienna, make sure it has the factory tow package installed, which mainly consists of an oil cooler.
Presuming this is your TV, I've found that my 2006 Sienna tows my 2720SL fine. I don't do mountains, but the 2008 has more horses than the 2006. Stay light in your packing, be safe, and have fun!
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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