I just got 5100s installed on my 07 Tundra...Love them so far for on road. I will test the off road this weekend. It leveled out my truck. I am sure they are the same for the Taco. Spacer lift will be stiff as it compresses the coil. For $388...get the 5100s, you'll be much happier.
Let me know how they do offroad!