Trailer light fuse blew twice

[mtm864]

I just recently purchased a 05 6.0 and when I got ready to pull outbwith dads 2 car trailer noticed no running lights popped hood all fuses good looked under dash a 20amp was blown replaced it drove about a hour with trailer and lights on then fuse blew and no lights again replaced drove another hour and didn't happen agiain anyone else have this problem? Or what could I start looking at first


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[Makolab]

Mins does the same thing but the fuse lasts a lot longer then yours. I hope someone has good input. Also, my power point on the dash blows EVERY fuse in a 12 volt plug! Annoying but maybe we can both get help here.