The bolts were tricky. Victory uses 80/20 for their rails, but unfortunately, 80/20 only has shorter (I think 1/2in) t-slot studs that fit in and suggest using the t-slot nuts instead of the studs. Problem with that is that you need to get very precise with cutting the bolts you screw in to...
I'm in the same boat but with the OVS 270 awning (they look to source the same exact brackets as 23zero). I'm doing as @TCM mentioned and ordering some 0.5in thick plates from mcmastercarr. I'm planning on using the existing slots in the brackets and just drilling some holes in the plate to act...