So first, you said your truck “can pull” 12100lbs, but your talking about the same truck that was the object of other threads.
7klbs is a lot for an old tundra with the little motor. Depends on the condition of you, the truck, the trailer, trailers setup and where you’re headed with it.
Is it ideal? Nope.
Will it work acceptably for someone? Yes.
Will it be acceptable for you? If you’re asking the question, your admitting inexperience and with that, I’d suggest a better equipped for all situations truck for you.
I rescind my previous comment