To the OP, at the very least, you need a proper gauge extension cord. If you intend to do it regularly, I suggest installing one of
these on the side of your trailer.
Use at least 14 ga. wiring to connect it to a single, dedicated receptacle.
It would be even better if you had an inline fuse or breaker so you don't have to rely on the breaker on the power post.
You can get a 15A surge protector power bar but they are a bit pricey.
And most importantly, before you follow my suggestion or that from anyone on the Internet, get an opinion from an electrician.
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2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)