Welcome Billy, I'm no expert but I thought that the Maple Leaf trucks were all assembled here in Canada, but I guess I was wrong. I keep learning stuff all the time. I also thought the heaviest Maple Leafs were 3 ton trucks.
Put an ad in the swap meet, see what is available from fellow bolters. There are a few in Aussie land here, not sure what they have.
Glad to see you want to keep her close to original, my thoughts too.
Leo