Those incentives were use to draw in sales so they could take market share from GM and close in on Ford. As Billy James mentioned, it worked pretty well. It's not going to be a regular thing, but I suspect they will do it again.
You have GM ramping up Silverado sales with bigger discounts and the all-new F150 will be shown in a few months, released next year. So I suspect FCA will continue to boost RAM sales from time to time.
Interesting is that not all dealers were participating in these "double discounts" in my area. The largest volume dealer of course was doing it, but the 3 or so other RAM dealers weren't, just your regular discounts.
I got lucky a couple weeks ago and just checking prices on local websites when I caught the huge discounts being advertised, got in just in time.