First my husband (good thing he is strong, too!) thought to find some other boulders to place under the wheels. He dug some out of the ground and got them under the wheels. That still wasn't enough to gain traction so I came up with the idea to wedge some smaller rocks behind the wheels. Now the front tires at least had something to grip on. These boulders he moved were over 100 lb. apiece! Then, an older couple (in their 70s) noticed us and pulled over. That was relieving until we realized they didn't have much to offer us, either. They agreed to help push, so my husband took the wheel and I joined the other two to push. We pushed and pushed and no luck. I was holding back just a bit not wanting to get hurt. But I also didn't want to sit on the side of the road in the heat waiting for a tow or whatever we hopefully would have been able to get to help us out.
I coached myself in my head as we were pushing and told myself to push the hardest I had ever pushed in my life, we tried one more time...and the car rolled off the boulders!!! We had no damage to the car!! We were only four days into our trip and I had been envisioning huge expenses, giant pains in the butt, and much time, effort and disruption to our trip to deal with getting the car off the boulder. And none of that happened! We got to continue on our merry way like nothing had even happened. We were most certainly very, very lucky, too.