Reese Straitline Hitch dual sway cam broke

Usually they snap when they bind on a turn. The bar pivots on the body of the part the cam slides into.

Was it bending prior to it breaking? I struggled with a Reese Strait Line setup for about 3 years, kept bending cam arm brackets. It had to have something to do with the angle I had to run my hitch head due to my setup with my Excursion. Without a doubt, if I would have kept running it, it would have snapped. Switched to a Equalizer and couldn't have been happier.

Hard to imagine such a thick shaft snapping!

Yes, give Reese a call. After I bought our DC WDH (1200 lbs), I found the cam arm brackets were poorly formed. They had a bad run for a while. They just sent me a new pair without issue. I think they've had parts manufactured in several countries and quality control likely suffered.

FWIW, the cam lobes do wear out over time and eventually need to get swapped from side to side, esp. with higher tongue weights. Our TW is about 950 lbs and after 5 seasons are getting to the point of having to swap them. So you won't have to swap them!

Also, are the bolts for the cam arm brackets staying tight? They can loosen when TW gets in the 1000+ lb range. There are a few ways to through-bolt them in place instead of using the Reese screws.

Nothing would've happened. the chain would still be holding up the broken cam and the WD bar. I agree on calling Reese. they sent me a new hitch head when I found mine damaged due to a bad design.

Nothing would have happened. I towed our 32.5' travel trailer all over the southeast for a year without the sway control arms on our Reese HP. Give Reese a call. I'd bet lunch they'll send you a new one.