for the top speed - sounds like you were being sucked along by that truck - not recommended making it a habit of being that close to a B double tho. BTW the big hill going down to Uriarra Crossing is good for top speed attempts - just have to make sure no one is turning out of the road going to the east side picnic area.
I’m very much a defensive rider. The b-double passed me just before a roundabout so I was only behind it when it was accelerating on the other side.
When did that happen - you used to love jumping on the back of a big truck going down Mona Vale Road...
Canberra has changed you man.