synergy_58 wrote:
It would be much nicer to be able to store an extra tank and then fill directly into the main to be able to use the water through the main system rather than have to poor from extra jugs.
No clue how yours is built but you can pick up an external water fill at most RV stores. they have a small locking door, fill hole and vent hole. You would have to hook into your tank fill line or tank with hose to fill and vent. We just use a funnel with a flex end so can bend it so it works right. Use it all the time. This is a must on all our rigs. Have used this type for the last 45 years. We often fill from water jugs.