Hi! I'm trying to decide on which truck to get. This truck will be used as a chip dump; 15 yard capacity, 84 CA or 108 CA. I have a question regarding the capability of the frames on the 4500 & 5500. There are five possible frames to choose from: 6mm 50,000 psi; 6mm 80,000 psi; 8mm 80,000 psi; reinforced 6mm; reinforced 8mm. With a 108 CA, 3/4 of the load will be carried between cab and differential. The truck that I had in mind is a 4500 with a 6mm 80,000 psi, 84 CA. It would be 18,500 pounds fully loaded. I'm not sure if this is strong enough to resist fatigue over time. Any thoughts would be helpful. Thanks!

gts