Don't feel insulted or anything like that, but that's not bright at all.
In such a case, you're planning for a disaster. A huge (for me) advantage of the Sienna is that it's:
- Heavy
- Long and wide
- Clearance is low.
That means that Sienna is extremely stable on Canadian slippery roads. Lifting it will jeopardize that. Sienna will be much more tending to roll over.
Quick story here. My buddy got a brand new truck. He decided to lift it to put 33" wheels. I told him that it's a stupid idea, but how cares, right? In a few weeks (during the winter period), he was going down the hill and flipped his truck over. Insurance declined his claim stating that he made modifications that led to the accident. He even went to court, but the judge ruled the same. So he ends up with 2 tons of scrapped metal and $60k debt. That's not even to mention his back imjury.
Do you really wanna follow that path?