True, VT if using just the cotterpins on both sides of the hitchpin as I described. However, I've seen some miniture padlocks at both HomeDepot & Lowes with skinny shank loops that might be able to wiggle thru the cotterpin hole of the chrome hitchpin. If you get two(2) minature padlocks sold as a pair that are "keyed alike", then you'd have a padlock on each side of the hitchpin using the same one key. I'm sure the right minature padlock is out there somewhere that would fit in those tight confines at the hitchpoint.
I would try my recommendation first, and simply hacksaw the chrome hitchpin to the bare minimum length as required and drill a secondary cotterpin hole. As Eric indicated; it is the "shear" strength that is most important, and by using the original chrome hitchpin then that strength is maintained regardless of how stubby the sawed-off hitchpin might become during the retrofit. Plus, I think it may be the simpliest solution to the problem without damaging the rear skid plate.
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