Hipocket,welcome from Scotland.
As you've found out the cabs are a tad tight for the slightly larger gent!
There are options available,which involves moving the gas tank to allow the seat to be moved further back.
There are also power steering systems available.
Beautiful truck BTW!

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.