The other end of the pipe - at trailer:
In a seasonal setup in Mexico, to connect trailer outlet to PVC pipe, I used
This swivel adapter. Very convenient, as you can easily disconnect it from trailer - if needed.
Onto those threads I put a
Flexible coupler (it says PVC, but the coupler is rubber).
Into the coupler I put a short piece of 3" PVC pipe, then elbow and another short piece of pipe to the ground (in fact, few inches into the ground), then another elbow and a long run of PVC pipe to the tank. Flexible coupler provides additional freedom of movement at the trailer end, to connect/disconnect, and also if you miscalculate the direction and need to adjust it.
Vinyl RV hoses are not popular in hot and sunny places like that. Also, as somebody noted, smooth PVC walls flash better than the hose.
garyemunson wrote:
Don't make the mistake of thinking you can now leave the black valve open all the time. As said above, keep it closed and wait until at least 3/4 full before dumping.
I dump it in the morning once a day or once every 2 days. There is usually enough water in there, sometimes I also empty pots and pans in toilet after washing, to add water to the tank - just water, no food leftovers. When I wait for 3 days or more, more smell from the tank makes its way into the trailer.
I use the cheapest toilet paper - there is no evidence that so-called RV paper dissolves much better. Paper doesn't actually dissolve, but disintegrates into separate cellulose fibers, making a white sludge. Then it rots like a wood, it takes time, so don't throw in too much. In rural Mexico a "septic tank" is usually a dry pit, 2 barrels in the ground, stacked one on top of another. It is "aerobic", things rot with air access, not "anaerobic" like a real septic tank. Process is faster than without air, but the barrels should not be placed close to the trailer and/or upwind.