You could just buy 2 sets. I found that the snap on ones are very handy but if you brush up against a limb they will be swept away. So plan on replacing them from time to time.
My new 2011 rig came with longer extensions than the older short ones and they have stayed put pretty well.
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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