--how many folks can remember seeing a picture of someone loading up there vehicle to the point were the frame "bent" in the middle and was dragging on the ground in the middle?
--how many folks can remember looking at a vehicle frame, were the vehicle got T-boned in the middle? and the frame and entire side was just crushed in?
--how many folks have used say a 2x6 or 2x8 as a couple ramps to load say a riding lawn mower or something else into bed of pickup truck or onto a trailer, and watched those boards just bend!
to many folks are use to seeing force going down. but perhaps folks have not thought out scenarios of side ways forces. more so with ground engagement equipment.
--i have had rear blades. steer the tractor. due to so much dirt / ground engagement built up. and/or snow built up on the blade.
--i have had bottom plow / moldboard plows steer the tractor due to getting into harder compact dirt or hitting a larger rock or root.
--i have had FEL general duty bucket and trying to push a down tree into a pile. steer the tractor side ways.
--i have bent wrenches, pry bars, various shovels and metal rakes.
--i have destroyed chains, cables, ropes. by trying to pull more than they can handle. and many times wanting to wipe back at me. (thankfully missing me and not killing me)
i am not sure i would want brackets on back of tractor braking, if they brake / crack / come off you are talking a large costly repair bill (just in parts alone)
--if a pin brakes / sheers off / comes off, i would be tearing them up all the time. and more likely looking back behind me and suddenly seeing a garbled up mess of equipment that is all mangled up and stuck up in a rear tire to boot.
--if top link / side link bends. they hold the equipment granted in an ugly way and maybe up into a tire. but still holds it and does not let it come loose dragging behind tractor.
--if a top link fails. / come loose (turn buckle comes undone somehow) at most the 3pt hitch implement comes back and smacks you in back of your head. or causes implement back side to flop up and down.
using the old manual shovel / rake. and trying to dig through hard compacted dirt. and jumping up and down on shovel to get it to go into dirt 1/2" at a time. then breaking out the tractor with 3pt hitch equipment... how much force ya gotta wonder is the equipment actually taking? its no longer a couple hundred lbs but most likely thousands of pounds of pressure.
how many times have you bent a piece of metal back and forth. to point it would break in half? some folks due it to tabs on beer cans, to metal pipe hanger rolls, to tabs on 110v electrical outlets, to split the 2 plug'ins up on the outlet. most of the time if you put your finger near point of were it is bending, your fingers get warmed up fairly quickly maybe evened burned.
--i have had discs, to even a bottom plow, to rear blade, to FEL general duty straight edge. get rather burning yourself hot to touch. due to friction alone and running down into the ground.
--i would imagine lower side link arms. getting hot from simple constant bending forces being placed on it. ((NOT A CLUE on this rambling)) but i would think 3 pt hitch links due heat up to some extent and possibly allowing them to bend per-maturely. though i am guessing this is a very low situation. i would think running into things backwards / pushing stuff would cause lower links to get damaged first along with ground engagment stuff and taking sharp turns cause more issues than anything.