Friends or not, carry a small note pad and pen and get a signed waver.
Now you're talking.
And, here is what it should say, more or less:
In consideration of the services of _____________________ in recovering my stuck vehicle, as a good Samaritan and volunteer ("Volunteer") and not for compensation, I do hereby release and agree to hold harmless and indemnify the VOLUNTEER, from any and all claims, actions, damages, liabilities, costs, or expenses (including reasonable attorneys fees), and without any limitation whatsoever, whether consisting of personal injury, property damage or death, that do or may result in any way from services provided by them, whether such injuries of any kind or nature are caused by their negligence or not, assuming for myself any and all responsibility and liability for same. Further, I agree that I will not sue any volunteer. I SPECIFICALLY AGREE THAT BEFORE PARTICIPATING I WILL INSPECT ALL AREAS INVOLVED FULLY REALIZING, ACCEPTING, AND UNDERSTANDING THAT vehicle recovery IS INHERENTLY RISKY AND DANGEROUS, AND CARRIES SIGNIFICANT RISK OF PERSONAL INJURY AND PROPERTY DAMAGE TO ME AND OTHERS.
This release and indemnity is binding upon my heirs, administrators, executors and personal representatives, and I herewith affirm my free and willing intent to execute it, acknowledging a complete understanding of its terms and conditions and the totality of its effect, and the waiver of any rights that I would otherwise have had, had this agreement not been executed. I warrant that I am the owner of the vehicle described below, or the owners representative. I hereby waive any right of subrogation on behalf of my insurer(s) and on behalf of any insurer of the vehicle described below and agree that no claim may be brought against the Volunteers by any such insurer by way of subrogation.
I HAVE READ AND UNDERSTOOD THE RELEASE AND INDEMNITY AGREEMENT ABOVE.