LED’s do not heat up as much as regular bulbs so wig-wag will have less affect on the bulbs.
However anyone with experience with maintenance of emergency vehicles knows they take a beating. It is not unusual to have to pull maintenance several times a month to fix/replace something. If this is a municipal/fire dept vehicle they already know the maintenance cost /cycle
If this is your personal vehicle plan on spending $$$. A shop specializing in outfitting emergency vehicles can address your fan running continuously while the lights alternate. Again plan on $$$ for the modification and for long term maint.
There is movement to reduce the use of sirens and flashing lights. Regular drivers (not someone with a CDL, mechanic, first responder etc) are frequently confused, ignore or try to beat an emergency vehicle blasting sirens and lighting up the intersection. The below average drivers can jam up the road trying to decide how to get out of the way. Studies are showing that a modest use of lights and sirens is just as effective and sometimes more efficient than full lights and siren. If they do not know the emergency vehicle is coming they can’t screw up. Though there are times that sirens and horns are needed, I’ve wanted a Mad Max plow once in a while.
Before you spend time and money pimping out a personal vehicle check with your county or state emergency services agency . Don’t listen to one first responder who likes an ego trip the lights and siren give them.