Caps are not totally useless, but they aren't a solve-all by any means. A decent cap will help with instantaneous power consumption, but you can't really hear the difference. As far as the lights dimming, a cap won't help much with that either. That has to do totally with the vehicle's charging system and its ability to provide enough current to maintain the audio system, the lighting, and all the other electical systems. The best thing you can do is the Big Three and get a stronger battery. Optima yellow tops seem to be the battery of choice in most cases, but other ones like the top end Die Hards, Autocraft Titaniums, etc. provide more than enough power for audio systems. The alternator in the RL is pretty strong, so that shouldn't be an issue. If anything, just do the Big Three first to see if that helps.Hey, I had to google what that was, but it seems like a good idea. When I have time I will have to do that. Thanks.