My logs are on the small side at 12 inch butts and 7 inch tips and they have been drying for almost a year so figure they only weigh around 600 or 700 pounds (that's only a guess).
I thought about using an old boat trailer that I had and build a rigging on it that resembles a old home made wrecker or a crane. I could use my come along to lift with. The pictures below is what it turned out to look like.
The original design that I was going to build used wood 6x6's to support the lifting beams. I decided instead to use some metal uprights that I have used on the trailer for another purpose. I canned the original idea to save weight on the trailer and not have to deal with cutting compound miters on both ends of the supports. (I'm not that smart:) ) After I finished the trailer I wished I had done it the way I had originally planned, so I went back and added the wood supports. Now I'm happy.