I have seen some other articles and commentary that suggest this was largely rider error. I've seen on other boards that the first reaction is to assume the cager acted with malice. In this case, there are reports that the truck/camper had its signal on to turn left (who knows how long), initiated the turn and that Rossmeyer impacted the door of the tow vehicle -- while passing in a no passing zone. I'm confused by the suggestion that multiple riders passed before he turned -- which would suggest the driver could have or should have seen Rossmeyer. Of course, the statement about the signal came from police reports and I'm sure the driver would claim he did signal regardless of whether he did or not. Nonetheless, this does not sound like the road rage, scare-the-rider situation. Hopefully, Rob can shed some true light from those present.
I'm sure further details will come out, and placing "fault" doesn't lessen the loss to Rossmeyer's friends and family. All too often we lose riders to a cager who doesn't see the rider because they aren't looking, particularly with the left turn in front of an oncoming rider. Here that isn't the case. I shudder to place myself in that truck and whether the same thing could have happened -- and I always look for bikes.
R.I.P. Bruce. May your family and friends find comfort and peace in this trying time.