And you've been stuck on the lawn before...
WTF did you go out there for? There no roads you can drive on to turn the coach around?
I'm only being a prick because the rest are being too kind, and you need to be told.
Ok, enough scolding and ridicule for the moment.
Time and the weather are your enemies.
Never mind the rest of the bullshit, that coach will come out of there on its own, provided you make sufficient preparations.
Get digging so that the sunken front tire has a ramp. If you think you've dug enough, dig some more! There better be a couple wheel barrows worth of material removed, if it really is down 6 inches.
And keep digging until it is DEEPER than the tire and put gravel in the bottom of the ramp so it has half a chance to roll out without sinking in further. You will note the ground gets softer the deeper you go... oh dear.
And dig on both sides of the tire, both the direction of intended exit, as well as the opposite direction, as well as beside the tire to be sure it is free and not bound. A lick of ice makes the whole thing a waste of time. Ice bound tires will not come out.
A coach CANNOT pull itself out of a wet paper bag, never mind sunken muddy divots.
However, a coach is able to pull itself up an incline, especially if it is on the move before encountering the incline.
Once the digging is done, your first move is forward, against the forward slope, and park it there, and go back and check your sad attempts at digging. Make more digging and then you are ready to try backwards. The trick is to run at the other slope, in the precious few inches of movement you have. Get against the slope, and if it stops, SO DO YOU! Do not spin the tires. I repeat, do not spin the tires. Same again, as your movement forward, leave it parked hard against the back of the slope and inspect and dig some more.
You will get yourself a trough of sorts, that you run back and forth in until you make the adjstments to the ramp so that it can roll out. Take the lazy man's way out and just try to make it go? Do you wonder what happens when the trough is so deep that the body touches down? Get out and look and adjust on every move.
Did I say, DO NOT SPIN THE TIRES? If they spin, you have not done sufficient preparation, go back to the shovel. Spin them, and you get to do MORE digging. This is not your swamp buggy, it is a coach, it only knows three things, back and forth and DOWN. Down is the default if back and forth are not possible.
Are you tired of digging yet? Go ahead and spin them tires some more then...
Also, pay attention to the rest of the wheels, every quarter inch of sunken mud will add up to defeat your attempt.
Ice under one drive? You don't have sand and salt there somewhere? Leave the tag axle air alone, the drives will just sink in harder. You may deflate the side on the hard ice, but don't deflate if on soft ground... or you get to dig some more...
But, I expect by the time you get back, the thaw will sink in the other tires, and then it will freeze again before you get back...
Did I forget to rudely question why you were on the lawn in the first place?
Do you have one of those AED things for the heart attack?
I only grudgingly give you part marks for exposing yourself so that we may turn this into an educational experience for the uninitiated busnuts in the congregation viewing this with amusement or trepidation.
Busnuts who drive on lawns get stuck. Bring a shovel.