I'm going to stick with my GSA. The pickup truck of motorcycles. Just the other day I rode an hour back from Harbor Freight with a sand blasting cabinet and 44 lbs of blast media, a rock tumbler and a couple of other things.
A whole case of beer (in bottles) fits in the right side case. The upper crash bars make a good lash point for 8' long materials laid on the top of the saddle bag.
The large tank is convenient for transporting fuel. If I ever need gas for the mower, saw or generator, I just siphon some out. Come to think of it, I have carried both my chainsaw and generator on my motorcycle.