Thanks for the info. I like being able to change back to a standard RV toilet setup. Resale value.
We've now been boondocking a few months at 7300 ft. this summer. 53 deg.F this morning. We've worked out most of our off-grid requirements now. 200 watts solar, Honda 2000, mobile hot-spot, Wilson amp, iPhone. One of us ( not me) is working 30 hours a week on the internet as a software consultant. We are about 30 miles from the nearest town, six miles from the nearest pavement. We have a 45 gallon flexible water bladder that we fill when we're in town, or sometimes from a nearby (3 miles) neighbor. It takes up very little room when we store it, and fits into a plywood frame I built into the bed of the pickup truck when we transport it. Stable at highway speeds.
For transferring from the vinyl "water bed" truck tank into the 27FB, I bought a 12volt water pump, 3gpm. from camping/RV store, 20 ft. of two conductor wire, two alligator clips, and a toggle switch from ACE hardware, and I crimp-lugged all that to the pump. So I can power it from the battery box, or the pickup truck, using the alligator clips. I cut a white water hose about six ft. from one end and placed the pump in-line there. So the 3 gpm pump will fill the 30 gallon RV tank in ten minutes.
(This setup would empty one of those five gallon tanks in 90 seconds, by the way, without having to ever lift the full tank.)
We just recently bought a "leg tank" from a Farm/Home style store that sits on the ground and holds 35 gallons. So now we can ferry water when convenient, and store more than another trailerful in the rotomolded tank. I bought a particle/carbon water filter that uses standard Camco cartridges, and put that on the output side of the pump. So all transported and stored water runs through fine particle and carbon filters before going into the trailer tank. I'm no longer known as the water Nazi. (Still called the amp Nazi, though)
The pump also serves as an emergency spare for the trailer's 4 gph water pump, which I've already replaced once. Same fittings. quick swap. The roto-molded leg-tank will fit in the bed of the pickup truck and is easy to transport and store. Only weighs a few pounds empty and impervious to weather.
We're on private land and can drain gray water into gopher holes all day and it disappears instantly into thirsty dirt. So our limiting factor is the black water tank. We have to haul the trailer to town every couple of weeks to dump the tank. KOA charges $ 20 to dump, but we spend another $20 and hook up for the night. Watch some cable TV. Do the laundry, grocery shopping. But KOA : boondocking :: marinas : remote anchorages.
I just realized we have not seen another human being since last Sunday. Today is Thursday. We like that.