I believe it would also depend on what fixtures are plumbed into which tanks. I had multiple tanks on my prior class c but only the outdoor sink was plumbed into the second gray tank. There one hose worked fine. On the Challenger with multiple gray tanks I have the kitchen and bathroom sinks plumbed into one and the shower and outdoor sink plumbed into the other. Since the shower and kitchen sinks are high use items I find it easier to take the extra 5 minutes to Y the hose.
One question I haven't seen asked or answered is with 4 tanks, how many dump stations (hose connections) are there on the coach; 2 or more?
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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