Personally, I have no problem pulling over to let faster traffic pass, doesn't matter what I'm on/in at the time, pulling a heavy trailer, some just plain slow vehicle, (my old 1946 willys jeep had a TOP speed of 50mph, cruised nicely at 45) or on the bicycle. If some impatient azzbite is behind me , I'd rather get him in front of me where he's easier to watch.
It's not a matter of having the right of way, it's simply common courtesy.
And finding a safe place where you can let someone by is a LOT safer than having them choose the time and place, when someone is wearing 3000lbs of chevrolet armor they don't have the same opinion of 'safe' as someone on a 20lb bicycle does
Up here, most tractor drivers will slide over to the side and let traffic by, again it's just courtesy.
Ken.