Not camping, but I am planning on carrying a tent and sleeping bag just in case.  Have been pondering on how to carry my luggage and I hit on what might be the solution.  A bracket that through-bolts onto a standard airline carry on size upright rolling suitcase:

(Click on either image for movie.)...
You can see why I wanted the CatsEye taillight under the fender lip to replace that clunky thing on top.  The case in the video is an old 18" x 13" x 10" Laptop case.

The making of the bracket was quite easy.  My high tech design plans:


As you can see, just a 15" piece of 3/4" x 1/8" flat weldable steel bent over the sissy bar.  On the backside, where the luggage will mount, I used bars out of a List-15 cabinet that already had 10-24 threaded holes on one inch centers ('cept for the last hole being 1.5" oc.)  If you can't find a List-15 cabinet, the original plan was for 3/4" x 1/8" flat steel.   The shorter front bars are 3/4" x 1/8" flat steel cut to fit precisely (actually since the sides taper you can slide up/down a bit to make it precise)

The sissybar is 5/8" square, but with a slight bulge on the top curve.  The back bars are welded to the outside of the side piece, the front brackets are inset about a 16th of an inch for a snug fit while still making it over the bulge.

Options to consider:  securing bracket/luggage to sissybar (I think I may have lost the first prototype, sans luggage, on a speed bump.)  I'll be using a bungee from the case handle down, but a locking bolt or clip through a front bar would work.

The inside bars and the bracket sandwich the two handle tubes of the rolling luggage.  Do not over-tighted to the point of crushing the tubes and making the handle unusable (the laptop case handle is now sticking, but since it has a broken zipper and tore interior, who cares!)

I had it on for the Full Moon Run a week and a smidge ago -- it carried a couple of jackets and my tripod.  I had also remounted my StreetScreen, about 2.5 inches above the headlight, top of screen about nose high.  The 115 mile run out to Palm Springs was mostly 65-75 mph and 61+ mpg.  Handling got a tad squirrly over 85 -- a common problem (so I've been told) with a fork mounted windsrceen.  Screen kept wind off the head just fine.  Bike was quite comfortable at 70-75.   Need a bigger headlight mounted a little higher to fill in under the windscreen as mounted.  I think the bag actually helped by completing the air bubble I was riding in.