Keep in in mind that Platinums are more loaded with profit than the lower trims so the discount seems bigger. As was said above, get on Edmunds to see what the MF are RV are:
Better yet, get on the supporter calculator here and get the numbers that will show you where you need to be:
Don’t target a monthly price, target the best overall deal by $/% off of MSRP with max incentives, lowest MF and 1 Pay/Max MSDs.