I am convinced MSRP is just there to allow the dealers to work more deals. If you have a trade in that you are making payments on you are likely upside down. The MSRP allows the dealers to roll that into the total cost, or give you an inflated trade in value and still finance the new trailer since the bank still sees the deal as within the list price. Obviously causes a person to overpay but it's a game the dealers play to make the sale, and if you are in a situation where you are ok overpaying a bit for a new trailer then it works out. Overall 25-30% seems to be the number.