I agree!
Why? 12K is almost a used car! I'd certainly do the loading and the driving for that much.
I know a couple people who've hired a church youth group to do some packing /all the truck loading. Church youth groups are usually planning some sort of a trip, so offer them snacks and a generous donation ... you'll get a bunch of enthusiastic workers and their adult supervisers.
Your used furniture and clothing has value to you, but not much actual monetary value ... I wouldn't worry about insurance.