Also you could just as easily run the LV transformers in a series with no redstone signals needed. They will pass along the packets from the previous LV transformer without affecting them.
This is what I normally do. LVT-->4 Copper Cables-->LVT, rinse and repeat until you get where you're going. Using two LVT's and a redstone signal to increase the distance works, but it's hardly cost effective. That method would require LVT-->LVT-->4 Copper Cables-->LVT-->LVT, or double the LVT's of the single LVT setup, and achieves the same thing. Simply point the LV end towards the MV end of the next LVT, and it works fine.