Tons of problems! Rv complete shutdown while driving?!

Replace all spark plugs and it's not as bad as some make it out to be here, just ford screwed the pooch on this design.
If it's intermittently misfiring it's likely not the coil itself but the boot or wire connection shorting. If the coils are bad, replace the offending ones.
I'd be asking for mechanic reccomendations wherever you need to get this fixed not repair advice as it's hard to diagnose problems like this over the innerweb.