I did a fabrication of a pannier rack over the rear wheel of a boB trailer , used the low-rider front racks in blackburn style
there some Knock offs copying those now, that and flatbar aluminum from the hardware store..

Now i prefer 2 wheel trailers..

snacking from the handlebar bags is still tough to beat along the way handling solid with well packed low front bags .
If anything , replace the rear load with the trailer.