Thanks, y'all. I'm still learning, and that is good.
I think I've got the concept of neutral-to-gound bond understood. I've also read that <2V across the N-G is considered normal, and that NEC guidance allows a bit more (up to 5%).
I am a little confused on how I have 3V with the RV's main breaker off, and with the main breaker on, it jumps to 24V. Unless I'm misunderstanding something, 24V is no where near the allowable amount by code.
@mexicowanderer In an open ground condition, but with all other parts of the circuit in proper condition, what should I see when I measure current from the frame to the established earth ground?
Thanks.