I have heard that the heated vests work very well. You can also get a heated seat and heaters for the inside of your boots. They all run off of 12V and if memory serves they don't really draw that much power. Not being a cycle guy anymore, I think the charging systems are more robust on them vs. a snowmobile. Might tax your charging system a bit more on a sled but IMO....so what....if the wife is happy....everybody is happy!! LOL!! Mount a 2nd battery in the sled to power all of the heating equipment!
X2 - Mine is cold in the house when it is 65My wife used to get cold too....now I leave her home...she's much warmer...and I can ride without nagging and whining..."it's cold"..."it's bumpy" "all your friends talk about is snowmobiles and boobs"...blah..blah..blah.... Leave her home...trust me...it works...![]()
Good luck, it is nice to have the wife along on trips sometimes. There better at some things than your buddies. LOL.