It is very likely something plugged into one of the outlets or a bad GFCI. The GFCI works on the principle of measuring the current flow leakage on the neutral compared to the hot. So even "if" the cord was too long, causing voltage drop it would still have equal current flow. This could be one or more little things. At house are you connected into a GFCI there? Is receptacle wired correctly? Are extension cords wired correctly and undamaged? A damaged cord could trip GFCI. Are these #12 awg cords? What are you trying to power up in RV? If you don't need the receptacles, leave that breaker off. Thought here is a GFCI at house, and one at RV (two GFCI's in series) could be part of the problem. GFCI circuits are wired in Series / Parallel. The feed is wired first to GFCI, the GFCI then can supply the load in a branch (split) style circuit.
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Doug & Tiffany
2016 F-350 Platinum DRW
2010 Harley Davidson FLHTK (Ultra Limited)
2015 Voltage 3605
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