Condition 
 | Action 
 | 
Loads greater than the frame is designed to
carry causes   sag. 
 | Straighten and reinforce the frame. Refer to 
Frame Straightening Description 
. 
 | 
Uneven load distribution
causes sag. 
 | 
Abrupt changes in   the section modulus. 
 | 
Improper body, or accessory mounting,
which   may include the following: 
|     •  | Holes drilled in the flange of the frame rail. |  
  
|     •  | Too many holes in the web section of the rail. |  
  
|     •  | Holes in the web section which are too close to each other. |  
  
|     •  | Four or more holes in the same vertical line of the rail web. |  
  
|     •  | Welds on the flange, particularly across the flange or along its
  edge. |  
  
|     •  | Cutting holes in the rail with a torch. |  
  
|     •  | Cutting notches anywhere on the rails. |  
  
 | 
A collision involving
the vehicle causes the following conditions: 
 | 
The use of equipment for which the frame has
not been designed or reinforced           causes the following  conditions: 
 |