Tuga,

If you ever sense wheel spin when you are not on a hard surface (and the coach is not moving) the only safe thing to do is stop and shut it off until you know what you are dealing with.

Unlike a car where a little rocking may do the trick, a bus just has too much mass to even consider trying that unless you are confident you are not making matters worse.

If you are alone, and starting to bury it and want to get out without a tow, raise it up as high as it will go, try to get the wheels in question off the ground with a jack which needs to be adequately supported by boards, and try to place planks or boards under the wheel that is spinning. The key is to stop the thing from burying itself deeper.

Once at a PP rally in Colorado Springs we watched a guy spin his wheels in the soft mud until he got the coach chassis all the way down to the ground. The only way a tow truck could pull him back out was to secure itself some distance from the coach and at a slight angle to the coach. When the winch on the tow truck started pulling he was pulling the buried coach back and sideways simultaneously. He was literally plowing mud with the bottom of the bay doors. It hurt to watch that. Horsing a coach on a soft surface is guaranteed to create much bigger problems.