I have a 2009.5 2720SL, swing away tongue, WDH (not equal-i-zer, but a similar model.) No sway control (not needed).
The brackets for the chains, on my set up, fit perfectly between the pin/join of the swing-away hitch, and the hinge where the slide-out is. It's like that small segment of the tongue was left empty specifically for the brackets to sit. I leave 2 chain links off the end (7th link from the bar end) and there is no issue with interference. This has nothing to do with the horizontal tanks, it's all about the slide out hinge and the swing-away points, and neither of those have been an issue for me. If the ends of the bars hit the slide-outs, you may need to tip the hitch ball away from the TV to give the bars more room. The height of the ball should also be adjustable.
I can see it being an issue if the WDH bars were significantly longer than they are, but mine are 800# bars, standard length, and there's plenty of clearance in either direction.
I wouldn't start messing around with sway control, because that might be too much hardware for that space, but a straightforward WDH? Nah.
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2009.5 2720SL
2006 Toyota Sienna
2018 Audi Q7
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