^ that.... it all seems very silly. You're going to have to compromise somewhere bud. Be it with 40lbs for a bigger sub..... or a MARGINALLY quieter set-up would save you at least a hundred pounds. Doing something like I suggested would mean you wouldn't need that HO alt (sucks performance), and you wouldn't need an extra battery (saves at least 60lbs). And you could use a lighter, and smaller amp (saves weight). And likely a little smaller box.Or you could get the sub that Tj linked for a measly $3,000. And then add weight and **** performance with your HO alt. And add weight with the battery.
An Icon on 1500w will still get decently loud. Box, sub, and amp and you're probably only up 100lbs.