My new 2501 has a plumbed portapotty that I’m a bit unclear on (and so is the dealer). It looks like this thing is pretty much permanently installed making the instructions useless. My 2520’s all had electric heads with overboard discharge and it does come in handy from time to time especially for my wife. I want to use this but I’m hesitant to have a mess that can only be pumped out. I can’t imagine a pump out gets it all ? Does some one have this option & use it that can tell me how it works before I try it ? Thanks !