We did not camp in the snow , but the 1st few times we camped it rained and we did not vent enough so we got alot of condensation from the roof leaking down.
We did have an issue around the seams of the tent end of water seeping in. Called FR and they said we need to get the tent end wet and allow the threads to swell and seal the holes. Did this a few times of letting the unit sit open in the rain and lightly wetting the tent ends with the hose and slowly drying. This sealed the thread holes. I was under the assumption that it should be water tight from the start. I guess this is why most dealers leave their units set up on the lot so the rain will naturally seal the tent ends.