This was a simple job.  Took maybe an hour.  Only needed 1 wrench for the toilet mounting bolts.  The water line has wing-nuts, so they are easily removed/installed by hand.  Turn off the water, and open a faucet to release the water pressure before starting.  Make sure you empty and flush your tank before beginning this project.  A healthy dose of Thetford's Aqua-Kem deodorant will keep your nose happy while the toilet is removed.  

This is a very easy DIY project.  I bought my MH used, so I expect such things to fail.  Not due to neglect, but rather due to age and usage.  While the odometer has 40,000 miles on it, I also lived in this coach for about a year.  I could have spent the time to locate parts and rebuild the original toilet, but I didn't think the savings would have been worth the time and effort.

The original Thetford toilet.  Served its time well.  This was a little challenging to remove.  One of the mounting bolts was under the foot pedal, the other was hidden behind the toilet.  This was a "comfortable" toilet with a wide seat.  Look at the new model to the right.

The new Thetford Aqua-Magic V toilet.  This is a low profile model since the toilet sits on a platform already.  It is a little taller than the original.  Notice the brass colored mounting hardware at the base of the toilet.  It was VERY easy to mount it.  With the narrow seat, don't expect to spend an afternoon reading your favorite book here!

Overhead shot of the original.  This one had two foot pedals.  One added water, the other flushed.

Overhead shot of the new one.  Note the vertical mount for the sprayer.  This one has a hand operated lever.  Pull it halfway and it adds water, all the way flushes it.  Easy to operate.

Back of the new toilet prior to the installation.  The sprayer is already attached.  The water supply line simply threads onto the fitting.  If the valve ever needs to be replaced, it's very easy to get to.

The mounting flange is very similar to one you'd find in a home.  I had to re-clock the mounting hardware by slipping the T-Bolts into other slots.  The toilet has a rubber seal that gets compressed as the hardware is tightened.  You can see the rust on the carpet from where the old toilet was leaking.  This is a good time to shampoo the carpet.

Very simple hookup in the back.  TIP:  Hook up the supply line before mounting the toilet.  This will prevent it from being cross-threaded, and allow you to examine the connection.  Once the toilet is mounted, it's very easy to cross-thread the fitting... ask me how I know!

I removed the old sprayer holder, and mounted the new one in the same location.  No telling what's behind the wall, so I used a non-electric screwdriver, and carefully made new holes very close to the old ones.

For such a job, I highly recommend wearing disposable gloves.  Latex gloves break down very quickly in the heat, and have very little strength.  Nitrile gloves, on the other hand (pun intended), are very tough.  I buy a couple of boxes each time they go on sale at Harbor Freight.  They have various sizes available.  These are strong enough to even work on your engine.

Chain of command outhouse...