Hey man, what's up? I posted a thread a few days back about the same topic. I tried searching before hand but not much came up. Then I saw the sticky at the top of the forum for this very topic, though didn't find the answers to my specific questions. My coils are almost new, they are the '99 height Toyota coils, but the load capacity sucks, just like on about every stock Toyota truck out there. I'm not sure why Toyota just doesn't put some decent coils/leafs on their trucks. Anyway, I emailed the guy at Toyteclifts (Doug I believe) and told them about my idea to put Old Man Emu 906 coils on the back. He said it should work fine, they only give about 1" of lift, and should work with the Tokico trekmaster shocks I have on there now. The 906 coils are a little heavier duty than the stock coils, so should handle weight better. That's the route I'm going to take in the near future. When I'm done putting them on, I'll post some pics.