I also put as lot of alternators on police cars. Here is why!
Police cars are loaded to the gills with electrical loads, an example is;
All loads on, lights, sirens, beams,alley lights etc, A crown vic pulls 112 amps at idle, Police issue alternator is rated at 125 amps at 2000 rpm, and you cannot successfully use more than 75% of an alternator capacity at continuous use. At idle the alternator is only charging approx 100 amps.
I have been boosting the charging system with a 200 amp alternator;
What i am trying to get at, is that our vn750 system is not very heavy duty and it is so easy to burn the stator out with voltage drop, bad battery, weak cell etc and added lighting, and that may not be your case, but we have all seen alot of that on small bikes, you dont need it. Run some hallogens and be done with it. I havent heard of a stator burning out at 37000 miles.