After driving with the outfit for 3,000 miles I was able to get to a competent RV repair place in Las Vegas (Las Vegas Trailer Supply). I brought the problem
up to Steve, and he adjusted the hitch. I agree with SteveH in his post that
the hitch ball was too far forward. Steve (at Las Vegas) adjusted the ball
backwards, and the angle is now proper, so that the trunnions no longer can
contact the two cam assemblies. There were actually marks on the new
ones that resulted from contacting the trunnions. So now they don't.
The angle is large enough. The initial adjustment was set up at an RV place
where I bought the system. It was out of adjustment ever since.