I have been lurking but want to advise Sam to reconsider before it is too late. A group of people coming together to help him solve his problem was a miracle and Doug's offer apparently another Christmas time miracle. Yet another party offering help figuring out transportation a third miracle. You see many miracles in this world?
Living in a snowed in cabin would make for limited perspective leading to bad decisions. I can tell you this is not looking good. My father who lived through the depression literally counting pennies to survive would have said to go back to Doug and ask if he will still sell it to you and simultaneously figure out how and if you can get it shipped to you.
There is risk getting anything shipped and some risk buying a used car sight unseen especially on a limited budget. Doug appears to be a stand up guy and getting a used car from him as low a risk as can be had buying a used car.
I am an expert on understanding people and their deal making capabilities and tell you that you need to straighten up and gain perspective. I know that is easy for me to say and maybe impossible for you to do, but it is the unavoidable truth and to be done before the situtation gets worse.
You are in a cabin in a rural area snowed in because of recurring horrible weather and declining health unable to afford escape. How much worse does it need to get before you realize it is a life or death situtation and help is a long way away? People here extended a helping hand which you should not count on again. If you take Doug's offer I will contribute $100 to help pay for the window repair.
I am a total pro at understanding transaction dynamics which is largely understanding people's emotions and situations and can tell you to adjust your thinking while you have a chance. You may view this as a rude thing to say, but maybe you should just sit back and consider your realistic options deciding which of the imperfect choices is best. I don't know you at all. You are nothing to me, but I just offered to give you $100 if you buy Doug's truck because I think you have a chance, not without risk, to save your life before it gets completely unsolvable.
It reminds me of the time people here came together to help a guy move from Alaska to Texas. The guy literally shot himself in the foot.