I'm not sure about the other vehicles, but the Vanguard's range is definately longer than the AT-ST's, so on open maps you can theoretically deal with it just by running backwards. On the downside its a stupid thing to have to do to take down a single vehicle. I think on dune sea its supposed to work that missiles kill aircraft which kill vehicles. If only i could hit the aircraft...
You're right about the public servers- I find its better if you play at about 1 in the morning when the kids are definately all in bed and won't bother me with their 'humour.' A lot of clan players will help you out if you ask, but it depends on the clan. And belgium players for some reason- though thats no help if you're in Canada.
'If you're the last man standing you're not fighting hard enough!'