There are a new group of options in the exterior tab of the you build it page, they include Rust protection,underbody protection, etc... for anywhere from 12 months to lifetime.

Link: http://www.dodge.ca/en/ram_1500/

 

It is nice to see that dodge has added that as an option package. in the past I have always demanded those options be thrown in on the price of the vehicle, but when you pay cash they will usually agree with anything within reason.