There is no problem using a 50amp adapter on your 30 amp trailer. in fact a lot of people prefer to do just that for several reasons to include the 50 amp receptacle is used less and less likely to be worn out and trip under a load.
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Jason & Wendy
2014 F350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16k fifth wheel hitch
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