I know I have said this before (every time there is a towing thread), but you also have to realize that tow ratings can be complete BS. The designers and engineers go through a careful testing process via ASTM standards; frame stiffness, cooling capacity, transmission torque capacity, even electrical load capacity... then the marketing team and the lawyers throw it all out the window and put their own number on it.
For instance, 94-96 Chevy Caprice with a 4.3L baby LT1, and 2.93 rear is rated to tow MORE than the 94-96 Impala SS with a 5.7L, 3.08 rear, and a host of suspension, oil cooler, power steering cooler, and a firmer shift programming. The lawyers said "no one is buying this to tow stuff, so we can lower our liability," and the marketing team said, "whatever." The engineers probably said, "why did we even test it?" followed by a string of swear words that would make a sailor blush.
Having said that, I don't advocate randomly ignoring them, but when my 91 Beretta said it could only tow 1000 lbs, I had no problem towing 2000. The weakest point was the Getrag 5 speed, not the suspension, not the unibody, not the braking. I wasn't violating any moral guidelines and putting anyone at risk, I was merely risking popping a secondary shaft out the side of the trans. Of course, I did have the advantage of having a few friends who were engineers or designers for GM, so I had the inside scoop on why it was rated for 1000.
Having towed large things for my entire driving history (my family if full of avid RVers and farmers, and I full-timed in a 10,000 lb trailer for many years, and I've been a CDL driver for decades), I don't mind making my own rules or pushing boundaries. Not saying it's smart, but the cargo I carry is usually very precious and valuable. I would never knowingly endanger my cargo, myself, or my fellow drivers, nor would I invite the wrath of law enforcement or insurance declinations.
I recall towing 12,000 lbs with a bumper-mounted ball in a 73 Impala station wagon. Of course, I was going three miles away, very slowly, on downtown streets. I also towed 10k lbs with of billboard-shaped travel trailer with a diesel F250 for about 100k miles over 7 years and wished I had bought a dually 1-ton. After driving all day countering crosswinds, trucks passing, and swerving to avoid idiots, I needed more truck. Anyone can handle some driving stress for a few miles, but a whole day of white knuckles made for a stressful trip.
In short, your 4-banger Ranger might tow 7000 a few miles, but you don't want to use it as a tow pig. If you're just going down the street, across town, or helping a friend move 5 miles away, sure, feel free to push things a wee bit, but nothing is more frustrating (and dangerous) than pushing the limits for a journey, or as regular practice.