One thing to remember is that if you ground to the battery, you're gonna want to fuse that ground lead. Otherwise, if for whatever reason the main battery ground corrodes/loosens/fails, the starter circuit is gonna find ground through whatever you wired up, should the ground side of the lights/etc actually be connected to the case... Not pretty.
For lights, I'd do chassis ground and fuggetaboudit.
2014 WK2 Overland 5.9L
2007 WK Limited 5.7L
And some past Durangos
Red WK #19, Hemi #68.. I think..
Durango Owners Club DOTY 2011
"Must have been that yesterday was the day that I was born"