And you're also right about the RV's. The 2 really close encounters I've had on tours have both been RV's. Small sample size but that's still 100%.
But do you really want to stand by the statement that in 4 continental crossings you've never once had a truck slow down when overtaking you? Riding a bike exposes you to a certain amount of danger that you would not face in a car, as your fellow Aussie's recent death all to clearly illustrates, but let's not make it out to be worse than it is.
I'm going to make up some numbers here but they represent what it feels like to me out on the road after 40 years and well over 100k miles on a bike. Probably 40% of the time I'm passed and there's a bad sight line or oncoming traffic ahead the car eases off the gas 50-100 yards behind me to assess the situation for a safe pass (AKA: the proper way to pass a cyclist). Then there's another 50% who stay on the gas till they're quite close and then hit their brakes hard when they realize they can't see around you or somebody's coming the other way (AKA: the stupid way to pass a cyclist). Now that still leaves a 10%± group of drivers that stay on the gas despite the fact they can't see what's coming the other way or there's not enough room because of car traffic ahead (AKA: the should be considered criminally negligent way to pass a cyclist) and that's plenty bad enough.