The light trucks to watch if overloaded are the older Japanese pickups. As rugged as even old-time Toyotas were, overloading was just asking for trouble.
Back in the 1990s I was on the Washington (DC) beltway and passed an early–1980s Mazda with an aftermarket work box replacing the pickup bed. The truck had been overloaded in the past so that the frame had begun to buckle between the cab and the work box. You could see the frame damage as you passed the truck. The front of the cab pointed toward the sky a bit, and the rear of the box was tilted up a bit too. I wonder whether it had passed Virginia safety inspection in that condition.
That was the same vintage Mazda as the last Ford Couriers sold here, so it had been Japanese–made. I hope that one was retired soon after I saw it.
My suspicion is that the US pickups, including our Rangers, have a certain allowance for overloading and the older foreign stuff had little or no allowance. I haven't heard of Chevy S-10s or Dodge Dakotas failing from overloading either. However, if the pickups have rusty frames and rear spring shackles, all bets are off.