OK, Maybe I have a better, and easier idea....
I will have 3 spots for bulbs.
One will be the white reverse light, this is easy.
One will be for a dual filament bulb, this is exactly what my stock 2004 truck has. I will connect this as usual.
The extra spot (with a red lense) will be for a single filament bulb. This is the one that is originally designed for the turn signal on a 1993-2000 truck. For this single filament bulb I can connect the positive to the positive on the turn signal bulb below, and the ground to the same ground.
If I am correct, the lights will function the same, except my bottom light will be a dual filament and it will be the only tail light, where as they will both blink for turnsignals and both work for brake lights?
Does this sound right?