Nic
+1y
Backspacing on 20s to lay rocker/door on dakotas is... Far as I know there is no such animal. You have to narrow the A-arms, and narrow the hell outta the rear end. There might be someone out there that is barely getting by with a custom set of super high offset wheels, but as for railling at speed, nope.
As for Zing the frame. You don't "have to Z" the frame. But if you like a huge hole in your hood or a huge hood scoop then that's fine. But to save around an inch of room it's better to Z the frame on majority of trucks. Dodge is one of the worst trucks that needs Zing done to allow the true frame to lay flat with the front clip. If not then the front Xmember lays first and the frame is not laying out and you have the front bumper off the ground, front part of your door off the ground and the roll pan diggin in the dirt laid out. I call it the "ghetto lean". But when Zing on dakotas it's not "just the front clip you worry about". Your exhaust, fuel tank and a host of other items will now be in the payevment. Basically take a LOOOONG stick (broom handle will do) and slide it along your bottom frame, whatever it hits, is what will be needed to lift or remove, including your factory leaf spring hangers.