You will not be disappointed with your equalizer. I loved mine and had/have the same setup you do (12K). We rented for a year before we bought the 5th wheel.
Don't forget to check the torque on those arm nuts every time you move the bars.
I would put some frame colored rustoleum in the holes. Whether you put the screws back in or not is up to you.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW