I totaled a camping trailer and truck by trying to pull too much with too little. Fortunately I didn't hurt my family or anyone else in the process. The price of the "right" truck is suddenly pretty low when sliding sideways down the highway, trailer tumbling behind you.
Everyone talks about the engine and pulling up hills, but that's not it at all. It's everything else that you have to worry about- suspension, axles, chassis, etc.
Just because someone pulled a loaded car trailer with a little 4 cylinder Toyota once doesn't make it the smart thing to do.