sounds like it's not a GFCI circuit problem, but a loose wire/wire connection within one of the downstream outlets, probably the one that had the 'heater' plugged into it...
many outlets within RVs are the 'stab' type, meaning that the wires are not trimmed back and wound around a screw within the outlet, but are simply 'stabbed' onto a piercing block on the back of the outlet that then makes the 'contact'. These aren't always so great when it comes to a 'solid' connection - my son had an outlet that started smoking and had one of the Neutral wires burned. I imagine that it was a connection that was no longer making a good 'connection'.
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...2014 Ameri lite 259BH...
the Turners...
two Campers, two Electric Cars
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