What do you mean by loaded suspension? Im using a size 14 key but that didnt work. Tried pliers. Nothing. I tried leverage with the pliers and still wont budge. I used a sh** ton of wd40. I dont have a torch lol.
I mean, do you have the car jacked up when you are trying to do this, or are you laying under the rear end? (this is your rear end links, right?) Suspension loaded means the suspension is under compression by the weight of the car on the ground, OR if you have the car up on jack stands and laying underneath, you can load the suspension by pushing up under the knuckle (behind the rotor) with a jack and block of wood, thereby compressing it of course.
Would you happen to have a size 14 key on a socket and an impact gun? If not, try to find a pipe to put on the key for more leverage.
Penetrating oil is soooo much better than WD40. Like JJ said, soak it. For stuff like that, I spray it down real good and then wrap it in a piece of cloth and tie it in place. Then soak the cloth.
If all else fails, cut that shit off with a dremel, t-grinder, saws-all, hack saw, you name it....