Sounds like fun!! How deep were the drifts; the ones I did in Wales were up to the top of the bonnet on the Rangey.
Hard to say really as the snow had pretty much filled the lane, all I knew was that when it stopped me and I started to spin I was sinking, so pretty deep. I wasn't finding the tarmac underneath at all.
Thinking back this morning, god knows how I would have got out if I'd have got really stuck, waited till Spring probably.