Off-roading in deep snow.
The smallest lightest vehicle with the largest tires possible.
You really need a LOT of gearing options for different snow conditions.
Super deep gearing can really help in some snow conditions, going VERY slow with like 100-200:1 gearing at an idle can give the snow time to compress and the air to escape.
It helps to have power sometimes, hurts other times, but it's always fun.
Tim Hardy tells stories about stripping his red Suzuki Samurai down for snow runs.........19XXlbs with a wide 35" tires and pretty much no air pressure.
The story was he had to stop going out because nobody could come even close to going the same places he was in the Sierra Nevada area.
He was worried he was going to get stuck so far back in nobody could come and help him.
At some point you get lucky enough to have just the right snow conditions with a vehicle that is light enough to stay on top.
You aren't pushing too much with the axles, bumper, grill, etc.
Then it will be the side-hill/slope that stops you.
Snow 'wheeling is a bucket of fun.
The difference in performance with my flatty at 1psi vs 2psi can be crazy.