How should we handle this?

My dad was in an accident... - Other driver T-Boned him - Other driver was at fault, we live in OR. Witnesses, Police Report - We have liability with Allstate, other driver has Progressive Our Truck 1998 Ford F-150, 120k miles. - They are offering us 2,200 for the truck + 1 week paid for rental - We are now out having to pay for another rental while shopping for anther truck that is going to cost us another 5-7k on top of the 2k they are offering us. Since the other driver was at fault, all medical bills are being paid by the other guys insurance. My dad has some whiplash, pulled tendons in both arms, and alot of discomfort but not enough pain to miss work. My question: What can we do to get the money for the new truck, the rental car, time spent having to shop for a new truck, and pain and suffering from the accident? - We are thinking somewhere from 5-10k total, but we are not sure how this stuff works. What about getting an accident attorney, or take them to small claims court. Any advice would be welcomed