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There was never any rails for the bedsides. The dunnage lifts the shelter off of the bed sides. All the S-250's are the same dimensions, just the interior layout, exterior panels etc are different. The only hardware in the bed is the front crossbar and the two rear brackets.

From the pictures in the HMMWV TM it looks to me like the install kit for the S250 bolts to the floor of the truck not he shelter. I will post some pictures of mine sitting in the dunnage. Mine is built from 2x6 pressure treated lumber and decking screws, I did not paint it.

Any cucv will need the dunnage for the S-250, all the cucv pickup beds are identical in interior dimension. The M1028 has the tie down bracket kit installed from the factory, overload springs. The cucv dunnage plans work with all the cucv's and a S-250. You don't need the dual wheel...

All the S-250's are the same on the bottom, if you have a CUCV/M880 you will need the dunnage.

You need the shelter cribbing/dunnage, most people don't know about it. It keeps the shelter centered in the bed and off of the bed rails. All the tie downs do is keep it from tipping out of the truck. There are plans to make it for the various trucks in the supply bulletin SB 11-640. I built...