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no, M105 is hydraulic over air. The m1101 uses a different surge unit. Only other one is the chassis m116 series flatbeds.

There was a post from someone with a m37 here that used rear brake set up on a trailer. Not sure on how that would work out? I also am interested in doing this as I picked up a mismatched trailer with a m101a2 surge and m101a1 axle. I kept the surge unit to see if I could do this in the future...

Safety chains have to be mounted to frame and/or bumper. They need to go to a 2nd point not the reciever . If your pins shears etc, then there is no back up to prevent catastrophic failure.

The universal link is what i use and supply to my customers. They are 3000lb each and the original hook slides into them perfectly with the other end in the receiver OE hole. Usually just the right length.

You can get the pins at mcmaster carr. Early ones had flat heads and the later ones were rounded.