Diesel Trucks

It all depends on what someone is pulling. The wife's run around is a small Toyoto what you call it. I has a v6 and runs like a striped *** ape. Yes it will pull a 18 ft car trailer with a 4-5000 pound car but how stable is it??? It has no brake control for trailer brakes, I would hate to stop it where my 1 ton does it NO problem.
I say v6's today are ate up with power, but that engine is it designed to pull loads?, the transmission is it designed to pull an not get hot an burn up? Just wondering.