Not sure on yours, but my 1998 243RKS has a breaker box behind one of the cabinet doors at the bottom of the kitchen cabinets.
My fresh water tank drain is at rear under tank...I have a sticker one side of coach at left rear that says "low point drain." It will be under the tank in any event.
2003 Ford F-350 XLT-4X2-Crew Cab-Short Bed - 6.8L V10; 4R100 Trans
2006 Tracker Pro Guide 16 WT, Mercury 60HP 4 Stroke; 9" Lowrance HDS; Motorguide Xi5 GPS