the only time i have ever used a rock hopper is when trolling. the retrieve speed to keep it upright and working properly is too high for just cast & retrieve in my taste. plus i feel you need a fairly decent sized lure running behind the rig to keep the mainline tight so the wire stays vertical.

if you are talking about trolling a rock hopper with a floating jighead thats a different story but one with a similar ending. when trolling, the floating jighead gets pulled too fast and basically runs straight behind the rock hopper. basically you would be better off with a regular hook because it was twist less. floating jigheads generally have a pretty awkward eyelit-to-hook shank angle that doesnt bode well to cast and retrieve fishing. its basically just a cast and let sit presentation like a slip bobber.