Some random thoughts:
Depends on your definition of "stuck". And why you're stuck. For example: If you're stuck because your skis froze down, and you're in fairly deep snow, dig out from under the fronts and backs of the skis, leaving the skis resting on a "pedestal" of snow, right under the axles, and also touching far aft. Then, get down and scrape those ski bottoms clean as best you can.
You do have a good shovel, right?
I prefer nothing but plastic touching snow.....I replace the steel skews with plastic....those steel skews are small, but they'll stick you tight.
Full power, stick forward to get the tailwheels out of snow, see-saw rudder...,stop to stop.
If you're on lake ice and the snow is shallow enough that you can get ice screws in, you're probably not stuck because of snow depth.....more likely frosted up skis. With all plastic bottoms, just before I climb in the plane, I give the toe of each ski a quick sideways kick.....doesn't have to be hard, you're trying to shear that frost off the ski bottoms. Get in, fire up and move the plane before it freezes down again.
You did cool down the skis after landing, right? Stop, let the skis cool a bit, taxi forward a ski length, stop, do this a couple times and park.
If you're stuck and you have a constant speed prop, and you're almost able to go, but not quite, run up max power, then pull that prop control all the way to coarse pitch, then back to fine pitch. The surge in thrust may get you moving.
If you're trying to pull a plane, with come along, snow go, etc, rig a rope bridle and attach to pedestal of ski. Usually, there's a bit of axle sticking out, and I carried a rope bridle with a small loop at each end. Run the end around the axle from inside to out, and loop over the axle stub on outside. That's how I pulled plane's out of hangars on straight skis...no dolly needed.
But, be very careful applying force to a stuck plane! They are a lot more fragile in this environment than you'd think.
Sometimes, the plane is pointed the wrong direction, and you can't use power without risking running into bushes, etc. This scenario offers tremendous potential to damage the plane. Those long skis afford a LOT of leverage on your axles and gear. If you have to turn a plane, do so a tiny bit at a time. Move the tail a TINY bit one direction, then walk around and take the side load off the skis, by kicking them, digging, or?? Then back to the tail, repeat.
If you have seven buddies to push (you lucky bugger!) show each of them EXACTLY where to push....even if they're pilots and should know better.
But, bottom line, if you're stuck in deep snow, you're in for a lot of shoveling, snowshoeing, etc.
If so, before you start, get a good big fire going if you can, and stop every once in a while to warm up/cool down, drink lots of water, and if you're not making good progress, get your camp set up before it gets dark and really cold and you're exhausted, sweaty and hypothermic.
MTV