What is a 1947 Harley Davidson Trike with a 45 inch motor worth? Its in good shape, runs good, needs nothing.

The guy is asking 8 grand, Im looking to buy it and resell it so id need to talk him down. I need to know though what someone will realistically pay for one of these things.

The only odd thing is that I guess its an automatic transmission because of the guys leg. How will this effect the value? I didnt know Harley ever made an automatic transmission.

Thanks in advance guys for any info!