2017 ram Night 24 vs 36

Hi everyone, it seems the MF and residual for a 2017 ram 1500 night 4x4 is 12/15k is

24 months: .00019 MF and 54%/53% residual
36 months: .00049 MF and 48%/46% residual

How come the dealers always say the 36 month is better and 24 pricing is always higher?

I see a few dealers have what I want, but not many so I want all the ammunition I need prior to sitting down.
Thank you.

Also thanks to this forum just got a Grand Cherokee limited 4x4, nav, sunroof for $349/month 36/12