110v power in the Cab? 05 off rd

Long time reader, first time Poster. I have this half baked plan of permanently running and extension cord under my truck into the cab. Making a nice outlet or two in the centre consul ish area. I have a 6 speed but i think there will be lots of room. Right now i Just have and extension cord running thought the back window from the back of the box. Come winter time this will suck a bit. I think 100w has so far been enough from the inverter. Not planning on running a microwave or any thing but if there is a easy way to trick the truck into the full 400w with out any major compromise i would be stoked on that too. Maybe i Missed this form? some one point me in the right direction and ill shut up.

 

https://www.tacomaworld.com/threads/how-to-ac-outlet-in-cab-400-watt-anytime-mod.322320/