Without getting too detailed, I also suspect your shore connection ("30 amp"). Are the state fair ground outlets new or been there for a while? If new, could be they're wired incorrectly, in which case, jump out of your rig when exiting. Don't mean to scare you, but there can be a danger if new or temporary wiring was done incorrectly.
Are you using an RV "dogbone" to convert to a 50amp connector? It is NOT a standard, household adaptor. You MUST have the RV-intended plug.
Do you have hydraulic slides or electric slides? If the jacks work and you have hydraulic slides, your problem is not electrical. If it's electric slides (I'm not familiar with them) and the parking brake IS on, then perhaps there is a tripped cuttout right on the electric motor. You would have to find & press a (red?) button to reset it.
Class C: fuse block in engine compartment?
These are just "WAGs" (Wild A'd Guesses)
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