You want the fuse as close to the battery as possible. Because the subwoofer is working mostly on the bass the low tonesit doesn't require as much directional pushing as speakers do. Your amp will always be on when your car is on, but it shouldn't make noise, so its OK. It will just plug into your truck and then connect color coordinated wires. Be sure that you know what's behind the spot where you are about to drill to avoid damaging any components.
Always keep in mind the position of your battery in the engine bay and make the most direct path to it with the main power wire.
Installing Subwoofers in a Car
I have had my sub for a few years and recently I had a few things in my boot, as i went round a corner something fell and it pulled ripped one of my cables off my speaker picture below. It is for demonstration purposes and it does not sound as good as it should. I also find, with years of experience, that using crimped and soldered and heat-shrinked round connectors on every screwed connection to be the safest and most secure way to go. Now for the Remote blue wire. My subwoofer has stopped working. Always remember to shut off the amp if you do so manually Soldering 12v power and ground connectors to the wires will reduce circuit resistance and make your power cleaner, giving you better sound.