Dual Cam Setup

mrekim wrote:

JBarca wrote:

On the non DC hitch the chain attached to the WD bar will swing towards the TT. Since it is attached to the WD bar, it is harder to see that inside WD bar unloading. And it may take more angle difference between TV and TT to go to zero load, however the load is still significantly reduced because the hitch head is titled in a force unloading direction.

This one I'm having a problem seeing. I always figured that, since the chain restricts movement, the inside bar won't unload much. If I'm picturing this correctly, as you turn, the outside bar chain will get pulled forward some and the inside one will get pushed backwards. Since the chain restricts movement and will effectively pull the spring bar up as it's pulled either forward or backward it seems like there will always be a non-trivial load on both bars.

I admit, I'm not picturing the compound angle hitch head movement you're describing yet. Would you expect both bars have a non-trivial amount of tension on a turn on flat ground?

A realization is "maybe" forming. The DC may add a load to the WD bar above the standard chain swing in the compound angle turn combined with a back flex situation to create a very high load in the snap up.

At this point I need to prove it or dissprove it to myself. I have studied/used the DC for so long it did not dawn on me until your post here thinking through this, the DC effect may be larger than prior thought. And you couple that with a very thin and flexible A frame rail and the combo may not be good.

While this may add to the reasons of why more DC's have shown up with up snap up failures, it does not answer why your DC frame plate crushed inward. Your A frame is part of something in the middle of all this. I cannot connect the dots where the DC caused "all" of the issues. At least not yet anyway. If someone was going to break a A Frame with a DC, 1,700# setup should of broke it by now.