Help with rust area on a frame

I'm looking to purchase a 2006 Tundra. And, I found a clean one with low miles in great shape. However, while I was inspecting it tonight, I noticed a few spots on the passenger side frame that had been patched.
And, on the driver side there was about a 6 inch long spot on the frame next to the gas take that has flaking on both sides. I poked around and its not all the through the frame, but it runs a few inches passed the flaking area.
Even though, the rest of the frame looks in decent condition. How much of an issue would this cause after getting it patched and having it inspected in va?

Or is this something to stay away from?

 

That's bad. It's full perforation rust. Could be repaired. Go over the rest of the frame and take as many pics as
you can. Track welded on brackets to body bushings, and crossmembers. Look at them in the cold light of day later.
Proceed with caution and a clear head.

 

That’s sort of a critical part of the frame you don’t want to mess around with if you don’t have to do so. You could weld a safe-t-cap there, but do you really want to do that on a vehicle you just bought?

Stay away and keep looking, something better will come along.

 

Run like hell.

I take it you read the “so you wanna buy…” sticky thread already, and that’s why you knew to look right?
That truck, you’re in for some surprises, I suspect you’re just scratching the surface…

 

And in case you didn’t: https://www.tundras.com/threads/so-you-wanna-buy-just-bought-a-1st-gen-tundra-eh.115928/

 

I had a bad feeling as soon as I seen that spot and figured you guys would have a lot more knowledge on it.

I spent the last two nights reviewing a ton of post on the First Gen Tundra about the rust issues and where to look.


Thanks again

 

https://youtu.be/j2s8yGMEbSs?si=pNTOHDstavX9OK7S

 

So, that area is where the frame brace is backed up on the inside of the frame and riveted together.
Water/salt/corrosion has gotten between the two pieces of steel and started to rust between them. This rust between the backer plate and frame has started to delaminate the steel. Since the two pieces are riveted together and the outside of each plate is still "strong" you will see the area between the rivets swelling because the rust between the plate and frame rail is causing the steel to delaminate and peel apart in layers.
One of the easiest ways to glance at a frame and see what it looks like is the BOTTOM of the frame below the backer plate, if the bottom of the frame rail is pooched down, then the backer plate is rusting and swelling. Regardless of what the side of the frame looks like, if the bottom of the frame rail is pooched down, its because the backer plate is rusting and swelling and you know you are on borrowed time because that section of the frame rail is the most likely to bend when you put a load in the bed or heavy tongue weight trailer. The backer plate is to strengthen the frame so the frame doesnt buckle and bend there like the Dodge Ram 3500 you have likely seen where the frame broke in half, in this exact same spot. The frame stiffener, backer plate, is purposefully meant to strengthen the frame, and its delaminated and becoming paper mache and will not do its job to strengthen the frame.