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Wont know without giving us some info on what your hitch hight is but looking at the trailer it looks like the pin box may need to go down so for your pickup it may be best to have your hitch at the highest setting.
Load test the batteries thats the first step as im thinking the batteries may be struggling. Ditch that K/N as fast as you can they are trash.
You are on the right path as you thought and the terminals look good
Just did my install on the GDP heater its a nice setup install is easy would be even easier without the dual alternator as you have more room for tools if you have big paws like i do. I did not remove the factory heater just left it unused currently until i have time to remove it completely. I...