Check with the manufacturer of the grab rail. They make spacers that can be installed at the mounting point to hold it away just enough to keep it from touching. On another rig, I made some myself with 1/4" plastic material.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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