Sway Bar problems of the 2003 Toyota Tacoma

I purchased this 2003 Toyota Tacoma 4 dr a few months ago I've been a Toyota owner for more than 6 yrs as my previous trk was also a Tacoma the body on this trk was spotless, no rust anywhere, the frame had surface rust but it didnt look too bad the trk needed tires & a bulb for safety. I felt like I had gotten lucky to get a nice dependable trk on the road. Within a month I noticed the trk was riding rougher. It seemed to be getting worse everyday. Tacoma doesn't have good suspension in the 1st place as I had to do it twice on my last trk. The trk had snow build up from the cold winter we were having, so I took it to the car wash to clean it up before putting `it in the shop. While washing it I noticed some scale rust came off under the drivers floor, I pulled it into the shop over the hoist & while setting the lift arms I noticed a substancial hole in my frame. I lifted the trk to find a piece of the frame starting at the lt front sway bar mount had rotted around the welded seam & disintegrated. The hole was15" long & another 8" hole on the rt rear in frt of the spring shackle. Toyota says they will replace the spare tire hanger under warranty but the frame is my issue as I did not have the frame inspected back in 2010 to extend the warr. Until 2017. I did not own the trk until 2014. Toyota is trying to hide behind a technicality that does not apply to the new owner. I feel Toyota should be held responsible for the excessive rust issue as they are well aware of the problem. They have had to re-call over 160. 000 units because of the fact they failed to use adequate rust protection in the 1st place. This trk & many other Toyota trks on the road are a potencial death trap. The world needs to be informed of Toyota not backing thier warr. & trying to keep the hush hush on thier recall for rust perforation. Toyota created the problem, Toyota needs to fix the problem.