Dropping the belly panel is not for the faint of heart.
It is also not something I would try "on the road" as there are a lot of screws holding it up. I would take out just enough screws to see where stuff is. I plan on making an inspection panel to cover a hole I plan to cut when I find out where it needs to be cut.
I will be putting in Horst Miracle Probes for Wastewater Tanks in Recreational Vehicles RVs
in the Spring and my belly panels will be coming down for that project.
Oh, BTW the web site has an AWESOME video on how the original sensors work and how they "fail." There is also a great scene of the fresh water tank probes and how they are mounted.
Again, not a vendor. I am a customer (although the probes are destined for my Christmas Stocking).
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW