You can mount RHPs, but it takes some care. First, the cage tops have ridges, so you need to orientate the panel and mounting holes to avoid those. Second, you cannot screw into the plastic. Well, you can, but it is not thick enough to be really strong. So you need thru-hole bolts and large area washers. Like fender washers.
Put the bolt head on the top of the cage. This way you can still stack cages. Use #8 or #10 truss head bolts - the heads are flatter.
Because the tops of these cages flex, getting the mounting holes to line up can be a pain. Visions were not taylor-made for RHP installs. You can do it, I have done it, it is worth it, but that darn slippery plastic ... it is impossible to fill an out-of-place hole because nothing sticks to that plastic - not epoxy, not silicon. So measure 47 times and drill once. Or better yet, drill one hole, mount the panel, prop up the other side, then use the RHP as your guide for the 2nd hole. Helps with a 2nd person.
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