Thanks for the insight I will read up and educate myself.
To answer the questions, no I am not the original owner. I have been experiencing a wobble from the time I bought the truck. My theory is the previous owner wheeled with it maybe a bit too rough and came down on the passenger side hard. I am thinking that it has been cracked and failing as long as I have had it then just the constant pressure on it from the big tires (35x12.50x17) steering at slow speeds just kept flexing it back and forth like a beer tab until one day wham-o it finally snapped. I have had the alignment done and the front end inspected for other damage by a very reputable mechanic in town and he says it is all good.
I am still a little nervous not knowing for 100% certain that it was damaged when I bought it so I am in the process of fabricating a bracket/brace (piece of mind). My original idea of going over the whole idle arm and welding in front and back won't work. There is not enough clear open space to weld to the frame on the rear side so I came up with the bracket design attached below that will weld only in front and bolt using the original idle arm bolt locations. I am thinking if I use 3/8" steel to fab it I should be good. This should keep it from failing or being able to rock back and forth again causing the mount to stress. Worse case scenario if somehow the original mount breaks in the same manner this will keep the idler arm basically held in place allowing a safe pull over and stop instead of a cart wheel down the highway.
Thoughts? Is my thinking logical on this or is there anything I am not considering?
Thanks for the help, pointers and feedback!!