Key to negotiation. Make sure they know you are willing to walk out. Another key: make physical printouts of other dealerships ads etc. In the middle of the sales person going to the manager, start looking over them and when the salesperson comes back, they will realize you are looking for they best price no matter where you will go to get it. This has worked Every time I have started doing this. The deal goes into my favor. Leverage is key. Have the physical paper copies. Do not just look over your phone. If they know you went to the trouble to print them out, they know you mean business. It's sad we have to do this but it's a game. Your results may vary. Best wishes!
I have a 1989 Dodge XPLORER RV Class B - Purchased 10/15/10 IN CASH
Fiance' purchased a Class C (B+ ?) 2002 Dynamax Carri-go on 5/1/15 IN CASH
We've got the best of both worlds