Wastewater leak

Typical RV black/gray waste water systems rely on gate valves which have rubber gaskets that can wear down or slide out of place - when that happens they can "drip". Replacing the waste valve's is usually pretty easy (lots of threads on that subject) and there not expensive. Don't think I have ever heard of drip issues that only happen when your "moving".

As the pipes flex while underway, a failing seal can leak. Eventually it will leak all the time. Replace the gate valve as soon as it's convenient. Gate valves are cheap, around $10 for the small grey water valve and about $15 for the black...four screws hold them in place and they slide out after removing them....installation is the reverse, but make sure the seal is seated when reinstalling....Dennis

Its not the gate valve that leaking. It is coming from somewhere well above gate valves. Like the pipe to the gate valves is broken. Is there a rubber gasket where the pipe goes into the tank??

some yes some no, most have a flange type with gaskets , then threaded or glued in, only way to tell is drop it, but it could be a kracked fitting , tough one.

Thanks midnightsadie I think you are right, but I have no idea how they are going to get to it to fix.

A picture is worth a thousand words - if it's not a gate valve issue and your new then you may have to take it to a repair shop and get their opinion - they often charge a minimum of $70+.