No offense but there are some very sneap-forum-esque answers here. Double tracked guitars all the time = less dynamics. Save double tracking for choruses.
I'd definitely use some stereo chorus on the bass - don't pan it 100 L/R - just enough to widen the low end a touch. Pan the rhythm to one side, again not 100 L or R. I'd use a stereo reverb to make it feel wider and also a mono delay panned to the other side. You'll have to automate the panning a lot but this will make your mix more interesting anyway.
This will give you waaaaaay more scope it inject more dynamics into the song. Double tracking definitely shouldn't be something you do for every part.