Brake pads I replaced on my 2006 E350 were Motorcraft (From Rock Auto) Heavy Duty "Police / Emergency" versions. There was a visual difference between the OEM & the Ones I replaced with.
If I need to do another replacement & can't find the same Pads, I would look at AKEBONO mfg. (They are the OEM supplier to a high number of Auto Mfgs.) Have used them on daily drivers. Raybestos Heavy Duty / police duty would be a good choice.
I have slotted / cross drilled rotors & Ceramic / Carbon pads on one vehicle but would Never do this on a RV.