Wiring in a reversing camera, need help finding wires.

[Tobias]

i have a reversing camera which i would like to fit to my TGE curtain sider, normally i would wire it to the break lights but this one requires all of it to be wired in at the front. Does anyone know where i might find the ACC and reverse light wire at the front of the vehicle? Any helps or tips would be appreciated if anyone else has had to do this.