TM 55-1425-289-14 Table 5-7. Continued Item No. Required Application C (cont) and nail to the semitrailer floor through the 2- x 4- x 36-inch piece with five 20d nails in a staggered pattern. Nail the other 2- x 4- x 36-inch piece to the one below in a like man- ner with five 30d nails. D 4 Chains, load-lashing. Attach to the front and rear tiedown provisions on the vehicles and semitrailer as indicated. Substitute, if de- sired, 112- or 5/8-inch IWRC wire rope in a complete loop, and secure with four cable clips spaced about 4 inches apart. E 4 Load binders. Secure grabhooks to chains, and take up slack with eccentric takeup. Grabhooks are not required if wire rope and cable clips are used. Table 5-8. Application of Materials for Blocking and Tiedown of an S280 Shelter, with OMTS, on Semitrailer (Fig 5-6) Item No. Required Application A 2 End blocks. Each to consist of one piece of 4- x 4- x 48-inch lumber. Center and place each piece against the end of the shelter, and nail to the floor with eight 60d nails. Nail the lower 2- x 4- x 48-inch piece to the 4- x 4- x 48-inch piece with eight 30d nails. Nail the upper 2- x 4- x 48-inch piece to the low- er piece with eight 20d nails. If the trailer or truck is equipped with a headboard, the for- ward end block should be placed prior to loading the shelter on the trailer or truck. Table 5-8. Continued Item No. Required Application B 4 Side blocks. Each to consist of one piece of 4- x 4- x 36-inch lumber and two pieces of 2- x 4- x 36-inch lumber. Place the 4- x 4- x 36-inch piece on the floor and against the shelter about 18 inches in from the end of the shelter. Nail to the floor with six 60d nails. Nail the lower 2- x 4- x 36-inch piece to the 4- x 4- x 36-inch piece with six 30d nails. Nail the upper 2- x 4- x 36-inch piece to the lower 2- x 4- x 36-inch piece with six 30d nails. C 8 Tiedowns. Each to consist of one piece of wire rope, 3/8-inch, 6 x 19, IWRC, length as required. Form a complete loop between the tiedown provision and the appropriate trailer stake pocket at a maximum angle of 450. Wire-rope ends should overlap approx- imately 24 inches. D 48 Clamps. Place four on each item E at the overlapped area. Space clamps 3-1/2 inches apart, with a minimum of 6 inches from the ends of the wire rope. Place one clamp on each thimble, item G, to secure the thimble to the wire rope at the trailer stake pockets and at the equipment tiedown provisions. E 16 Thimbles. Locate one under the wire rope at each place where the wire rope passes through the equipment tiedown provisions and over the edge of the trailer stake pockets. Secure each thimble to the wire rope with one 3/8-inch clamp. Figure 5-4. Blocking and tiedown of M35 truck on 12-ton, or larger, semitrailer. 5-7