Having engineering background, I would say that having a huge moment arm (assuming 15 foot poles), the clamp will rotate on the frame. Think about only 10 pounds of force (pulling a rig) at 15 feet out is 150 ft lbs of rotational force on that little clamp. It is doubtful it will keep from spinning. If you can through bolt or weld the holder to the frame then maybe, but take into account that you will also be weakening the frame by doing so. Maybe you should just move them down if you have the space.
Without seeing how it would clamp on makes this just an opinion. There might be a way to attach the rod holder so that the force is parallel with the frame then you might be OK. (Is it one clamp, or two on the holder?) Got any pics?
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