Welcome!
I've had issues in the past with riding amusement park rides that would not lock because of my size. The scary thing is that I was 14 yrs of age at the time.
I travelled from the states to the Philippines 18 months ago, and I'm startled by the cultural differences with weight. I didn't have an issue with the flights themselves (as I'm certain from AU to US the flying hours must be similiarly hellish).
While I certainly met some overweight people, the lack of larger clothing sizes and the knowledge that most transportation/dining accomodations/etc are designed for much smaller-framed people. I doubt I'm the only obese person that feels this way, but I have a very large personal-space bubble. This was something I didn't anticipate having issues with overseas.
Anyhow, welcome and good luck to you sir