I fabricated the fuse panel using a mix of auto and household electrical parts. The negative ground bus is a standard house fuse panel part cut to size. The fuse panel is an auto panel that allows for 6 spade fuses. The housing consists of a panel box extender mated with a 240v waterproof outlet lid. The lid originally sported a round outlet opening. I cut a square opening in it. Then I drilled and tapped the base to accept the lid. Profile height is under 1 1/2". Small and effective.

12v Trailer Fuse Panel