Along with the preapproval, Play dealers against each other. There competing for your business.
Also NADA doesn't show you what trade in is, and no matter how good of condition your coach is in, the Dealers are going to offer you low trade in. And Options don't make a difference.
Which is why we sold ours outright after we ordered our coach. We had 90 days to sell with the fall back that if we didn't sell we could still trade. But if you buy off the lot your options are few. They won't wait for you to sell.