You can get rebates from Ford and use D,A,X,Z-plan. I have done it twice. You have to just go there and ask what rebates are available. From there tell them you will be using x plan. They will pull the invoice and you will see the x-plan price. Then you take the rebate away from x plan price.
If the salesman says they don't do that its because they don't want to. Ask to talk to fleet sales or credit union sales. They are more volume sellers then one at a time.