by Grummy » Thu Jan 14, 2021 2:48 pm
In addition to the above,... How Much ? How many gallons of black space do you really need or want ? It's all a bit of a guessing game that depends on how often you can dump, how the continuously changing weights affect tongue weight as well as what your options are to compensate when necessary. And then, yes, how much clearance you have underfloor. Most regular old cargo trailers do not have much compared to modern travel trailers all up there in the wind.
Then your drain has to be located such that it is lower yet, and you do not need to tear that off in a driveway approach at a fast food place, or anywhere for that matter.
I went porta-potti this time because a 5gal unit can last more days than I thought with just two people who have other options during the day, but really only prefer to have it at night for the convenience factor. Easy to deal with over the black tank in my situation.
I've often thought that if I had to do a true black tank again, I would keep it's size on the small to moderate side, then find a way to carry and store a portable tank for dumping without having to move, or just for the emergency additional space. But I would not want to have to SEE that tank either, so It would need it's own storage spot.