[Motor31]

Most everything has already been covered. The only thing I'd add is that you'll have a real fun time threading the new cable up and around to the water control box area for the grey valve. Make sure you lube up the new cable assembly before you install it. Getting to it is a PITA later on and it is difficult to see the lube extends beyond just the handle and valve locations. You are going to get covered in fiberglass for this so wear long sleeves, tape the cuffs, button the top button and wear heavy latex or rubber gloves. Don't forget protective eye wear as glass fibers in the eyes is no joke, it WILL hurt your eyes.

My toilet had a leaking flapper valve issue for quite some time no matter how often I cleaned it and tensioned the bowl band. Last year the spring mechanism failed completely while on the road. Thetford makes a cartridge replacement as it is not repairable. It was a 5 minute repair job. The part comes in 2 "flavors". One with a new flapper valve and without. In your case I STRONGLY suggest you get the pack with both the flapper valve and spring cartridge. It cost us about $65 IIRC. In our case simply replacing the spring cartridge took care of the leaking issue entirely. It shouldn't have but somehow it did. I have the new flapper valve in my "spares" box now.

I also carry a new water control valve with me for the toilet as well. Since the "brilliant" design folks at DRV failed to put a valve between the toilet and inlet water line there is no way to shut off the water to the toilet if the valve fails without turning off the house water entirely. If it fails and the bowl does not leak into the black tank, it will overflow the toilet into the trailer. If you are like me that will happen in the middle of the night. No fun waking up to use the toilet and finding you are standing on a wet floor. Fortunately the valve replacement does not require toilet bowl removal.

In my rig there is also no valve at any of the water line junctions at the sinks either. When I replaced the kitchen faucet a few months ago I bought a couple inline valves so I could shut the water off without having to close it at the main line inlet. Yeah, drv saved a few pennies there.