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Where to mount P3 and towing questions

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My 2016 Sierra AT is a 5.3 v8 with a 3.43 gear ratio, says I can tow 9,100 lbs and I have a 1,496 lb payload. 

I bought a 6,400 pound travel trailer, 32’ long from hitch to end, 660 tongue weight with an Anderson weight distribution hitch. Everyone says towing a TT with a half ton is dangerous but if I’m careful I think I’ll be ok. 

My truck doesn’t have a brake controller so I was going to get the P3 everyone talks about. My question is where do you mount it? I see some mount it low but that doesn’t make sense to me. 

Also, I don’t want to get rid of my mirrors. Are there good clip on type mirrors I can buy that will do the job?


any help is appreciated. 

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