Any chance you can get 2x8s under the back tire? But, then again I think you have a tag on that one and I doubt the tag will support enough weight to get you up even if you got the wood under the tires. Boy, this has to hurt.
Sorry I don't have any better ideas. On our rig I don't think you can let air out of the front bags when you are in drive mode. So, that is why I would try the wood. Something to let your tire get a grip.
Pls let us know how this turns out.
On edit: not sure how I missed the other posts on putting wood under the back tires. But, I agree with the other posters on this.
