I know many of you are having the same problem with the bed rusting from below where the x-members are spot welded. Toyota is well aware of this problem. When I had my frame replaced, the service manager asked me to come back so they could get pictures. He said Toyota corporate is "watching" the problem and 2 mechanics at the dealer have the same issue.
Mine is a 2000 with 255000 miles on it. Yes I'm in MN and it's old and high miles. But....... I have zero rust anywhere else on the truck. It gets constant underside washes in the winter, has been "Herculined" and hase been covered with tonneau all its life.
I am NOT looking for anyone who does not have this issue to chime in (as in other threads on this issue) with: maybe it was in an accident, should have washed it more, bed was replaced with aftermarket, ..........etc. This is a known defect. What I would like to see is members with this issue to post pics (I'll have mine up soon). If we do that, and all of us call Toyota, they may be motivated to at least handle it on a case by case basis. The voice of many will be heard.
Toyota issues many "double secret" recalls; which if you complain enough, the vehicle is fixed. The prime example is the front brake rotor warping on 2000-2003 Tundras & Sequoias. Ask the service manager:
Hey are there any TSB's on my truck?
Ran the VIN and nothing comes up.
What about the front rotors that keep warping and vibrating?
Hmm, I haven't heard anything about that.
My understanding is the rotors and calipers were undersized causing overheating/warping and Toyota is replacing them with bigger ones.
Boy that doesn't ring a bell.
What about TSB BR004-002?
Ohhhhh, that one. Let's get you scheduled for a brake upgrade.
So guys (and gals), let's escalate this!!