You need a mid bass driver instead of those "full range" jobbies if you want some bass out of the doors. Frequency response and the response curve are 2 different things. A speaker will have a frequency response from 20hz-20khz but the 20hz is at -20dbs and the 20khz is at -30dbs on the frequency curve. Full range drivers or 2/3 way speakers really fall flat on their face in the frequencies we want them to be efficient at for bass reproduction. My best suggestion is an exodus anarchy 6.5 driver set for the doors if you want bass an to not require adding a subwoofer and amp. The anarchy plays down to 40hz with authority. I have been very impressed with what those little guys can do. However they are also the biggest 6.5 I ha e ever laid hands on. They are like 4-5" from surround to backplate on the motor and weigh more than most 8" woofers.
As far as the 8's in the doors of the wrangler, I dont see you having much issue with that. My wife's patriot limited has 8's in the doors from the factory and that little bugger impressed me as far as how flat the response is for a factory stereo. It just sounds great and really doesn't lack anything at any frequency above 30hz other than the ridiculous amount of power that I am used to...lol That being said, try out some tantric sounds Ld8's run as a component setup. You'll need no subwoofer, and if you run some American Bass sealed back 5.25 silver flutes and a decent set of silk dome tweeters you will be more than happy with the outcome and have a beautiful musicality from wherever the tweeters cut off at on the high end, all the way deep into the 30's with the 8's sealed in the doors in about .25-.5 cubes net each.