I would not recommend the choo choo wagon for snow either. It is not snow friendly and you have to really strain your back to get it to go through because the wheels stop spinning.

I had the same issue as you and bit the bullet and got myself a 4 seater Runabout stroller. The Runabout really seems to be the best for snow. It has tall thin tires that can slice through even deep snow.

I know there are some good recommendations for sleds though. They can also be tough on your back though. Be wary of hurting your back and straining yourself.

I just needed Spinal surgery because I damaged it from pulling kids and lifting and I would say nothing is worth going through that. Be careful with your body foremost