whats the biggest gauge amp power wire that'll fit under plastic trim by the door, the one that has the screws on it by the edge

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2010 Ranger XL Reg. Cab 4 cyl... 5 speed manual... W/reverse.

Mods: 5% tint on rear window, JVC KDHDR40 Headunit, Kicker KS-68 speakers, Kicker TCVT102 (10TCVT102) Sub, JVC DRVN KSAX3102 Amp, JVC DRVN KSAX3101D mono amp, Ford black rubber mat, White LED license plate lights. Added 6000k HID Fogs, 6000k Digital HID Heads.

This isn't gramhar skool so dont cry and whine about spelling.