Water Leak - Keystone Everest

[LadyAries]

Ok, well, I have a big issue that needs to get fixed. Ideally someone close to me, but I'll just have to do the best I can.
There's a huge water leak under my trailer. It's not a tank issue, it's just water, but I can't figure out where it's coming from and it's leaving a big puddle in the dirt. The pass-thru also smells mildewed, so this kinda needs attention.

[Camp CA]

Ouch!!

Our first fifth wheel trailer was a Keystone Everest. Suggest tracing all the lines to see if you can isolate / pinpoint the leak. Sometimes they are at the plastic fittings connected to faucets and toilet, which is what I experienced and replaced them with brass fittings. If you cannot find the leak(s) suggest contacting a competent mobile rv tech or shop to find and repair it. Good luck.

[Carl n Susan]

Are you connected to shore water constantly?
Have you used the black tank flush recently?

Is there a constant drip or does it it occur intermittently?
Are you grey tanks open to the sewer or closed?
Where is the puddle located under the RV?

You may want to look behind the convenience center water connections to see if the leak is back there. That might explain the pass through mildew smell.

[LadyAries]

Ok, what am I looking for? Is there a specific location? It's a constant dripping that only stops when I turn off the water supply.
I talked with a fellow RV friend and he said I needed to open the belly, get under it, and figure it out to fix it. Well I have no bloody idea what I'm doing.
So now I have a whole mess of questions.....how does the underbelly connect on an 06 Keystone Everest? Can I remove it myself? Where do I start looking for the leak? What tools do I need? How does the belly reattach? Do I need a hammer, a screwdriver, channel lock pliers? Can I jerryrig something out of duct tape?

I already figured I've got to shut off the water to let the ground dry out for a day or so. I've got a rolling board I can lay on while I'm under the rig. What do I do next?

[LadyAries]

How does the underbelly connect on a Keystone Everest? Can I take it off myself? What tools do I need? I should probably be able to see where the leak is coming from, given that the water is very hard here.
Can I jerryrig something with duct tape? Is there a better repair method? Can I do everything myself?

[Gooma]

Before you go tearing the underbelly off, check all the lines and connections inside that you can see. Follow all the lines back to the water tank and very carefully check every connection and the lines themselves. They may have frozen and split.

[LadyAries]

Oooooh, good point. I haven't seen anything leaking inside, but the brass connector that connects the city water line to the rig has an annoying tendency to drip. Do I need to remove that and put in a rubber O ring?
Also I'm 90% certain the source is coming from somewhere in the underbelly, which then trickles to the front into a second puddle. The pass-through storage floor is damp as well