If they reject it, you get the $4200 back, right?

Then it's not a total loss, and you can go elsewhere. I'm sure you can get something comparable online for less than the dealer wants.

I'd call the sales manager though, and let him know that the business manager is going to cost him $$. You might try calling the service manager as well, because if the business manager screws you over, your service dollars can go elsewhere. Aside from extended warranties and accessories, service is what keeps food on the dealer's table.