Sorry to see that you have had no luck in finding that elusive sensor... Rheavn and Dons2346 are giving you good advice and they can attest to how difficult that lil' sucker can be to locate... But, keep the faith! ...It is in there somewhere between the front bumper and the rear bumper, for sure!
Here's a couple of "detective" hints that may help you in your search:
1. If you can get to the back of the control panel and/or electronic "box", see if you can identify the "sender" wires and take note of how they look. Mine is a grey "quad wire" (4-wire) bundle much like the phone company uses for phone installation.
Since you can't easily trace this carrier all the way to the sender, see if you can find it in any of the wire chases you can open upgoing toward the rear of the coach... keep tracing that wire bundle till you find the leveling sensor. I know, easier said than done, for sure.
2. If you really want to get scientific, borrow or purchase a "signal generator"... a battery-powered device used by equipment installers. You simply clip it on to one end of a set of wires and use a hand-held wand to track the wires (via an audible tone) through walls, conduits, etc. to its terminus. Again, this is not easy, but if you really need to find that sensor, it may be necessary.
As always, use caution regarding pinch-points and collapse hazards when working under your coach. Chock it, block it, and keep yourself safe!
As a final note, if you are ever in the Central Florida area and still need to find the sensor, I will be glad to try to help you.
Best of luck,
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"