Harley Davidson Tattoos

Want to trade in my 2004 ST1300 for the 2010 Harley Wide Glide. I owe 7K on it, how much might I get in trade?

I know that the Blue book is $5300, what should I expect in trade. My ST1300 is in good condition with low miles for its age. Secondly how does the difference between what I owe and what the pay getting rolled into the new bike work?