BN-7910 



Figure 4. --One of rear stacks of a 

 test load showing shift of two 

 bottom layers of boxes toward rear 

 of trailer and shift of upper three 

 layers forward. 



BN-7911 



Figure 5. --Rear of test shipment show- 

 ing use of a 1-inch thick board be- 

 hind three wooden boxes between 

 bottom of rear stack and rear doors 

 of trailer to prevent shift of lower 

 layers of stacks toward rear doors 

 and blocking of air circulation. 

 Crayon mark (see arrow) marks orig- 

 nial position of layers at time of 

 loading which shifted toward front 

 of trailer. 



There were several instances where the boxes in the rear stacks of the 

 trailer were loaded with their longest dimension crosswise of the vehicle. 

 Boxes so loaded had a greater tendency to fall back against the rear door 

 than boxes loaded lengthwise. In one or two loads the boxes loaded crosswise 

 in the rear stacks were loosely stacked in an attempt to fill out the stacks 

 with less than the normal number of boxes per stack, leaving considerable 

 lateral slack at one side of the trailer (fig. 7). This caused the boxes to 

 shift, even with the load locks in place, with some damage to the containers. 

 To prevent damage the loose stacks should have been placed farther forward in 

 the trailer, and all boxes in the rear stacks should have been fitted tightly 

 against each other and loaded across the trailer so there could have been no 

 lateral movement and shifting in this part of the load. 



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