Which Equalizer Hitch

Back when we purchased our current Freedom Express I calculated it's gross tongue weight would land somewhere around 600 lbs once loaded and ready to camp ... measuring later with my Sherline tongue weight scale confirmed it's typically running in the 600 to 625 lb range. Since I'd used a 1,000 / 10,000 lb Equal-i-zer with our previous KZ Spree which typically ran ~ 750 lbs gross tongue weight I emailed Progress to ask if running a bit over 600 lbs with the 600 / 6,000 lb version would be OK. The answer was "no problem" but I shouldn't exceed 10% over rating, or ~ 660 lbs. As it turned out I was gifted a Reese trunnion bar system with 800 lb bars so I never did buy an Equal-i-zer but had I purchased anything I'd have instead gone with a Blue Ox Sway Pro with 750 lb spring bars ... FAR easier to set up, has a fixed head angle so there's no head washers to fool with, is silent in operation, and best of all if one ever changes to a trailer in a different weight rating the only item that needs to be changed are the spring bars - with an Equal-i-zer you gotta change the whole thing. Considering this, in your case I'd try it out first with what you already have.