Light circuit has a shared neutral. (As mentioned previously.)
Your fencer is designed to leak current to ground. That is what a gfci is supposed to detect. Try unplugging the electric fencer.
Other than those two thoughts, reduce the circuit till the problem goes away. [unhook sections]
I trust you are using at least 10 gauge wire with the 30 A breaker, the current interrupting device is sized to the wire.
"Sub panel grounded at the barn"; I can read too much into this description, I don't think you want to "ground" sub panels... and there are specific code rules about sub panel distance when to employ grounds.
At this point I would be consulting a real electrician...
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