Looking at all of these lighting systems i am surprised at how hard it is to find these options.
1)Headlights stay on
2)Taillights dim and bright when brake applied and turn off when reversing.
3) reverse light that comes on when backing up
i will call rc-lights and see if this unit does what we need for a loader:
http://www.rc-lights.com/products/RCL5053.html