Ya but do I run PVC from the RV to that hole in the ground?It depends on the size of the septic system but the short answer is "Perhaps"
Some septic systems are small. dumping an RV's tanks might overload it.
However if you dump frequently should not be an issue.
Some RV's the black tank is hundreds of gallons.. others 20 gallons. Most inbetween)
Do you know what you have beyond that hole? Are you sure that it is a working septic system? Even if it is you still need to use the black tank or it could collect solids and in time become plugged up. That same thing could be a problem with the hole in the ground.Ya but do I run PVC from the RV to that hole in the ground?
Best to have a qualified specialist come by and evaluate what this hole in the ground is and what you can do with it. A Civil Engineer would be the professional that would normally respond to this sort of inquiry however, there are local contractors who build septic systems that may offer good enough information.
Yes it is similar to the photo. There is a house still on the septic tank so it works. Only part of the house was demolished leaving the hole where a toilet used to be the hole like the one in your photo. We are using a sink, shower and a toilet on the same septic tank.If I read your post correctly you have a fitting in some sort of house pad (cement?) with a fitting similar to the one in my photo - toilet mount.
1/ My concern is if the rest of the plumbing is still on the pad there are other drains (sinks/showers/etc). Any blockage in the sewer line could cause a potential back up in the system and black waste to spill on the ground. You likely can generate smells out of the other drains as well.
2/ If the sewer to septic lines are done right and depending on the distance to the septic there should be a cleanout. If I were to do this I would locate the septic, dig out the main pipe and tie into it there. But I would seal off the rest of the old house.
3/ Then there is the legality of it. In my county In FL) in order to hook up an RV an RV occupancy permit must be obtained. In my case it required the septic to be pumped out and certified as part of the county permitting process.
For those following along my situation is basically exactly like OP. A collapsed mobile home with existing septic tank and I went through the permit process and redid the sewer/septic plumbing with a 4 inch threaded clean out to hook the RV pipe into.
That explains things a lot better - You have a partially fallen house, the remaining house is using this same septic still and you want to dump the RV into that.Yes it is similar to the photo. There is a house still on the septic tank so it works. Only part of the house was demolished leaving the hole where a toilet used to be the hole like the one in your photo. We are using a sink, shower and a toilet on the same septic tank.