Overland track:transport and gas

Hi to everyone!
I'm from Saint-Petersburg,Russia. I've booked OT for 26.02 and night ferry Melbourne - Devonport 25.02.
I've suggested 2.45 between ferry and Tassielink bus is enough gap. But I recently found out that there are problems with transportation of gas. " you can take it to ship but must be put in container and give to be taken into a special place on ship. BUT it will be the last thing that will be given to passengers and you could wait a very long time. Remember that all cars will go off ship first. "
So "it is BEST to buy your gas in Devonport"
I don't know Australian realities and ask an advice.
What is better - to buy gas in Melbourne and to take on the ferry or to buy it in Devonport?
Or, possible, I can buy it directly in Cradle Mountain?
If in Melbourne - how much time I can loose on the ferry?
If in Devonport - is some outdoor shops nearby Information center at 92 Formby Street? Are they open at 9 a.m?
If I'm late the bus, there's a way to get Cradle Mountain besides a taxi?
Where is optimal way of action?
One more question about my pack. It's 80 sm high but ferry rules demand 68 sm maximum.Should I take it in my Luggage and will it cause another loss of time? What does baggage collection look like, is it possible to get it even before the arrival of the ferry?
Aleksandr.
p.s. One more radical way - cancelled the ferry and take a plane to Launceston. But the ferry more convenient (exept problem above). Plane is minus day.
I'm from Saint-Petersburg,Russia. I've booked OT for 26.02 and night ferry Melbourne - Devonport 25.02.
I've suggested 2.45 between ferry and Tassielink bus is enough gap. But I recently found out that there are problems with transportation of gas. " you can take it to ship but must be put in container and give to be taken into a special place on ship. BUT it will be the last thing that will be given to passengers and you could wait a very long time. Remember that all cars will go off ship first. "
So "it is BEST to buy your gas in Devonport"
I don't know Australian realities and ask an advice.
What is better - to buy gas in Melbourne and to take on the ferry or to buy it in Devonport?
Or, possible, I can buy it directly in Cradle Mountain?
If in Melbourne - how much time I can loose on the ferry?
If in Devonport - is some outdoor shops nearby Information center at 92 Formby Street? Are they open at 9 a.m?
If I'm late the bus, there's a way to get Cradle Mountain besides a taxi?
Where is optimal way of action?
One more question about my pack. It's 80 sm high but ferry rules demand 68 sm maximum.Should I take it in my Luggage and will it cause another loss of time? What does baggage collection look like, is it possible to get it even before the arrival of the ferry?
Aleksandr.
p.s. One more radical way - cancelled the ferry and take a plane to Launceston. But the ferry more convenient (exept problem above). Plane is minus day.