In both the Garmin and Vans installations, the bolt and nut are tightened down to proper torque specs, and the bolt does not rotate, and shrould not
rotate. Both installation methods use friction locknuts, in one case it is a platenut, and in the other case it is a regular nyloc.
The rotation occurs in the bearings of the rod end.
If the bolt needed to rotate, you would need a cotter pin and castle nut.
I suspect that the Vans installation will be easier to both install, and later remove if necessary.
My 2 cents. [BTW, why can't we do away with pennies and nickels, and round off to the nearest ten cents.....]