We have a 2018 24F, and for what it is worth we have plenty of lighting every where we need it......sometimes I think too much lighting....under the dinette cabinets....on the ceiling over the dinette......then there is all of the kitchen and cabin lighting........plus the step lighting .....the bedroom lighting is confined to the bedroom.....on the up side there are plenty of switches to control the lighting......btw we have LED lighting in all of the outside storage areas....and then as far as the double valving on the black water tank, I was told that it was to prevent the pipe between the two valves, that runs the width of the unit, from carrying the weight of black water as you go down the road, meaning that when you are finished draining the black tank, shut off the valve closest to the tank first and then the other.
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