I use switchback LED's from SuperbrightLEDs.com front and rear. In the front I use white as DRL & parking lights (no amber parking lights allowed here) and amber for the turn signal. If you switch on the turn signal the white LED shuts off and the amber part flashes. After turning off the turn signals the white will go on again.
In the rear I use the switchbacks for backup/turn (no red turn signal allowed here), but those are a bit different. If you put the van in reverse and hit the turn signal the white and amber lights up alternating. Those are a bit dimmer than the ones in the front, but overall brighter than the stock bulbs.
The flasher is just some generic heavy duty electronic one. Housings are the stock clear ones.
The rears:
The fronts in my old RAM: