Early 80's must be when they started that.
Scott:The early 80's must have been when they started this. Our '85 H'31 also has the molded in tanks. Our holding tank is molded in under the v-berth (never leaked). Our water tank is located under the aft quarter berth. The seal on the lid leaked and has been repaired. The water tank looked perfect inside except for a little silt from the well water that we have been pumping into the tank for the last 16 years.