looking to do the 2x6 rockers on my rig, and was wondering if someone could go measure their rockers on a 4 door if it makes any difference... id like to order my steel from the local yard but i dont know how much to order. i would go out and just measure it but the truck is about an hour away from me right now. thanks.

 

60 1/2" each side. That will do the full rocker length, tightly. Don't go shorter. Consider 62" per side and you could trim them back to suit your tastes. I wanted to provide a longer distance across the wheel openings for future tire growth and wheel well trimming.
I had no inner rockers (nor flooring) remaining so 2x6 was an easy full tuck. In hindsight I would have gone 2 x 8 x 1/4 wall for a full tuck and left more stick out beyond the lower lip of the doors. But 2x6x3/16 is still tough. Can lift the whole truck by jacking at mid point of the rocker.
If your metal is still good behind the outer rocker panel, a 2x6 will tuck in nice and leave some outward for good protection.
Lots of pics for reference in one of my albums.

 

thank you for the pics and info, i may go with 2x8, i would like enough stickout to maybe tie an exo cage into eventually. ive seen that done before. my inner rockers are still good. i hope.

 

Hmm, that sounds like a plan I may want to examine further. Great Idea w/ a 2x8

 

I went with 64" per side, tapered at a 45 degree angle from the top to the bottom at the front, straight down in the rear. If I were to do it again I would probably do 60-62"s. I have my wheel well opened for 35s and have no issues, but I pushed the axle forward too. There is no differences between 2/4 doors for lengths. Only one less door to work around. There's more changes depending on years with structural bracing.