Thanks for posing your questions "damon c", I am fairly new to using a tractor and your post generated saftey issues that I may have created for myself. In particular the verticle movement of the 3pt under a trailer load - had not considered this, thanks "rambler" and "Baby Grand" for pointing out workable solutions and maybe saving me and my tractor from potential damage.
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Thanks to the comments made here I'll find a way to strap the link down - just in case.
These types of things are best done when not needed because usually when they are needed it's too late!