Off-Door Side photo...
Single blue hose with shutoff on left will drain the fresh water tank.
Dual dark hoses are same as Door Side hoses....overfill/vent hoses. They came from factory open....I installed the 2 valves to eliminate syphoning effect when fresh tank is full and travelling.
I would think your photo of single hose is the drain and if dropped thru like mine, you best put on a valve!!
Your photo of dual hoses is probably the overfills....so yes, you should have 4 overfill/vents hoses for your 2 Fresh water tanks