Towing Set Up Advice (Astro Van)

Hi everyone, my wife and I just ordered a 2005 3124 KB the other day and was wondering if I could get some input or advice about my towing situation.
First we are going to tow with our 2003 Chevy Astro van AWD (factory tow package/ 3:42 rear gear) - I am purchasing a model 1722B Equa-lizer hitch (1000 lbs model) and a prodigy brake controller.

I have towed many trailers, but not many with brakes - and none with a WDH.
We are fairly new to camping and trying to educate ourselves about this whole WDH towing deal.

Do any of you Astro/Safari owners use a set of the extended mirrors or do the factory mirrors work fine?

Does the factory tow package wiring harness have a large enough (key hot) power wire to run the fridge in 12V mode while traveling? (dealer says the wire size should be no less than 10 guage).

Any and all advice will be greatly appreiciated!!!

Brad