Hello, Real Nice Truck, definitely a ‘40. Tonner Express. Definitely a 3/4 hauler. These are great trucks. I got my brakes at Napa.
The wheels are of the wide five pattern, but are wider than cars with slots not the artillery type. Getting a bit hard to find.
Some had milk truck “High Clearance” very rare. The Y is your model 122” wheel base.
Chuck Trucks is a good source, he is very helpful and loves the Big trucks.
I have a bunch of stuff for these, doesn’t look like you need much. Enjoy !!