My husband is out to sea a lot, so keeping it and parting it out is not an option for me.
I will answer some of your questions, but will have to wait until I get home to look up the others.

We have had no major engine or transmission problems. This has been a GREAT vehicle. We bought it brand new and have done all the routine maintenance according to the owner's manual. I believe the timing belt has been changed twice - at 100k and again at 200k, but I will check on that to be sure. I know all the fluids and filters have been regularly changed, it always seemed like it was time to change some fluid or filter! My husband did some of the maintenance, but he is gone a lot so I have been through a few mechanics before I found the last one who has been wonderful. Now, don't laugh - it is my local DCJ dealership! The shop foreman and the lead mechanic live right near me and are both nice guys. I had a bad experience with a local mechanic who only does Jeeps and assured me his guy knew diesels - not true - and so I took a chance on the dealership. I told them that I had access to a great forum of knowledgable CRD owners and that I knew where they both lived. When I did the GDE tune, Derek was interested and made sure no one tried to flash or plug in their little diagnostic tool when I brought the car in. I had a glow plug fail, so I ordered the 7v metal plugs from Italy and he installed them. Overall, a great experience there. Plus, I could take my car to his house and he would drive it in and then home for me when it needed work. We live about 25 minutes out in the country, so this has been very nice. Anyway ... I did do the tune from GDE, put the new glow plugs in, but nothing else spectacular. Most of the miles would be considered highway miles, since we live so far from town. I remember when the car was newer we had quite a few issues with the torque converter and it was replaced, but it was all covered by the warranty. We have used 5W40 synthetic oil (I think).
I loved that car. I am very sad to see it go. I have not seen it since the accident, but I will be going over today to get the rest of my personal items out of it.
Someone asked if we were injured - no major injuries! I was driving and took the brunt of the impact, but I have had some aches and headaches and nothing more.
Thanks again for your help and advice. I will check my records when I get home and see if I have anything else to report. I am trying to console myself by thinking that it had so many miles on it that it was probably going to give me some major problem soon. I did notice recently that I had to add a little antifreeze from time to time, so I wonder about the integrity of the head and bolts. I would still rather replace the head than think about buying another car. I am unsure about buying a used Liberty, because how will I know it has been taken care of as well as we took care of ours?
I have a few pictures of the car, if anyone is interested in seeing them just send me a message and I will email them to you. It does not look bad to me, but apparently it is. The adjuster told me the known damages were $9000 and the frame was bent.