I love Toyota's and I love my runners. Owned every generation but the 3rd, but I have to totally disagree. The 1st and 2nd are incredibly unsafe in an accident. They are tall, narrow and have 0 impact zones. The 2nd gen's before 1992 do not even have roof crash support. They had to add it due to horrid results of roofs collapsing.
They have such low crash ratings because of everything above and some others.... but, understand that many cars of that era have equally horrid results.
A strong steel bumper does everything at 5mph and nothing at 70. Impact crash zones, which have since been added to every major car, don't try to prevent any damage... this is utterly impossible. They work with energy and redirect it. Crash zones, whether in a bumper or door are strategic areas designed to "smush" in, in a controlled fashion, to protect what they refer to as the "cage" or the passenger "zone". Even your cheapest car today is 100 times safer than a car made in the late 80's and early 90's.
That solid bumper has gone the way of the dodoo bird for exactly the reason that at speed, it became a weight to simply crush or kill someone.
I am going to have to agree with the crash ratings.. In relation to even the cheapest KIA made today, a 1990 4runner is not a safe purchase for a new driver. They like to tip over and offer 0 safety.
Also, understand I know this from experience. I was hit by a guy on heroin. I was lucky. he hit and slide down my length of the car, rather than head on. Had he, I would be dead. Those doors have literally 0 protection. Want to see? Take that flimsy door panel off... it is a thin panel of sheet metal with 0 structural support.
Sell the runner, or keep it yourself. Your young driver should be elsewhere.