Too right it's a heavy load. If they were regular aussie house bricks it would be 331Kg per layer + 36Kg for the 10 bricks over the wheel arches. Thats a tonne for every three layers. 
Lucky it is tough!

Commodore utes are built on the sedan underpinnings - using independant suspension for a 'comfy' ride.. and have a usable load rating of 4-600kg. Falcons continued using their leaf sprung 80's chassis and kept updating it giving them their 1t load limit on suitable models.
Hiluxs have a load rating of 1t from factory, and this one has uprated suspension by Lovells. Paver weight 1200kg, moved 2 suburbs over on backstreets - the only thing that didnt like it was the tyres.. they were over their load limit, but they are fine.
On another note, picked up more pavers and some roadbase yesterday... I should get out there and start :\