Komatsu USA only has trucks up to 35,000# capacity. I don't know much about their bigger trucks but typically the bigger Japanese trucks don't hold their value very well. They also are usually equipped with drum type brakes rather than air or wet disc brakes.
Most buyers of bigger trucks are more learned consumers than users of smaller trucks, thus they are more interested in quality, creature comforts, and price is probably 4th of 5th on the list instead of 1st. That is proven by Taylor being the #1 seller in this class.
You might also want to check how long your loads are because if they weigh 40,000# and are longer than 48", you will need to get a truck that is rated at 36" or 48" load center. Most Japanese trucks up to 35,000# capacity are only rated at 24" load center.
If I were you, I would stick with the major players- Taylor, Linde and Hyster. I am biased but I think that you will find that the Linde trucks offer the best "driving" truck.