Hi Ernie. I've not got any direct experience of a XR400 but I've faced the same problem on a XR600 and did eventually manage to load quite a bit onto it without anything breaking - pic below shows what I took on one trip
It involved making up a "subframe to attach to the subframe" to spread the load into the main part of the frame rather than having it all hanging on the end bolts and reinforcing the original Honda welding - particularly the area at the end of the subframe where the plastics attach. You'll also need to consider cross bracing to cut down on side to side movement.
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