i know people who have used tow balls for drag blocks on s-10s, worked ok, but have also bent their frames where it was attached. I noticed our trucks frame is boxed all around. harder to bend, but no real ideal spot to put a tow ball.
so, got a SD drag block kit, easy install since i dont have a welder at the moment.
got a 7/8 hole saw, though id recommend going down one size since they seem to cut a bit larger than 7/8...
drilled center, between the holes(plenty of room, doubt it will weaken the mount).
Now have the option to use $6 walmart replacement "drag blocks" as well. the do hang lower, and may not be the safest thing to drag, but when moneys tight, makes a nice alternative....