I agree that there is not an abundance of room to begin with between the seat and steering wheel in the AD trucks.
Plus the temptation is to put lots of padding/foam in the seat to make it comfortable. I recently went through this with my friend's '49 3100. We agreed that there was too much padding so I did remove abut half of the foam I had installed. It is still plenty comfortable and with a little more room.
If you think this is tight, try a Model T!
