assuming you need full 360 warning, i'd do the following
--(2) M7 grill lights mounted to the exterior of the grill
--(2) SOS universal undercover inserts in the fogs, or (2) vertexes (which you could very easily sync w/ the M7's)
--(1) tomar 200s high power dash light
--whelen lin6 on the sides of the front bumper
--SOS intersectors (prob. using the 10 degree wedges) or Ghosts clipped beneath the mirrors
--2 tir6 slimlighters on the headliner on bail mounts, or an ultralite 8 w/ L-brackets
--(4) SOS universal undercover inserts (2 red in the brake lights, 2 amber in the reverse)
assuming you can use a siren, I'd mount a cencom gold on a bail bracket right around the recessed area beneath the A/C controls.
the older bulky spectras would be kinda tough in a bench seat, so if you could, then i'd get a remote control head and mount it in the console. whelen sa315 speaker behind the grill.
unlike the others, i don't think its necessary to have lighting up front above the RVM because you're gonna be higher up than most other vehicles (your dash light will prob. be seen in the RVMs of other ppl and anything above your RVM prob won't be seen unless the ppl in front of you are far away)