Adding interior power.

[Stew47]

Hello all. New here. Just bought 21 3500 to pull incoming fifth wheel. Pretty excited. It’s a tradesman which I like for camping. Open doors and blow everything out. Sand, dog hair , grass clippings whatever. Only issue is I need to add some interior power. 12 v outlets and power for an inverter in the back plus running couple more outlets under front bench should be plenty. I’m thinking straight from battery, circuit breaker, wire under the truck, coming up in the back under the seat and a small fuse block is what I’ve done before. Before I start though I’d love to know who has done similar job but knows easier spots to pick power. Thanks all.