[artfuldodger]

I have used the gravity feed 0 times on our 2008 3605, so its absence would not be noticed by us. I have used the sanitize method 2 or 3 times a year, including a 50 gal. fill up at Quartzite from my pickup bed bladder. Sometimes though, there is a priming glitch that I don't have when when winterizing. I am thinking that if I started the water flowing through an inside tap,like when winterizing, then closed the tap and opened the tank fill valve that this would get around the priming problem. Sure beats the gravity feed or having to buy and carry an extra pump.IMHO