Just keep in mind that comparing factory tow ratings to what they can actually tow is like speed limits are to what a safe speed is to drive on a certain road. Big difference between a 95 year old on heart medication with a record of hitting every fireplug in a 56 chevy pickup vs a middle aged person with a flawless record in a brand new Suby with braking assist, AWD, ABS, lane departure warning, and a modern suspension design... but the law says that 65 mph is equally moral for both of them.
There is the legal side where you could technically be cited for towing too much if you get discovered in an accident, but who would actually enforce it? Police are given the power to question it, or use their discernment to investigate, but they don't have scales, nor do they have a chart that matches your VIN to a tow rating.
Factory tow ratings are 1 part ASTM engineering and 6 parts marketing. There is a reason why the same generation of F150 might be rated for anywhere from 4000-13,5000 lbs depending on the combination of parts.
Classic examples: my 94 Mazda B4000 is rated to tow 3500. A 2000 Ranger 4.0L (which is the same truck with the same springs, engine, brakes, and radiator as my 94) could be rated for up to 6100. That's almost double. The reason is not what the truck can safely handle, it's because the 94 has a weaksauce A4LD transmission and the 2000 has a 4R44E... which is a vast upgrade despite it's similarity. That doesn't mean it's legal to tow 6000 with my 94, but it handles it beautifully.
My 96 Impala SS is rated for pathetically low numbers despite being better equipped than a comparable Caprice because the marketing gurus knew that SS buyers weren't getting them as tow pigs. Lower tow rating, lower liability on warranty repair, win/win.
Contrast that with a newer F150 rated to tow 13,500. I have towed 8000 lbs with one. It didn't impress me with how it handled the load, and from that experience I certainly wouldn't feel safe towing 13,500 with it... but Chevy advertises 13,000, so Ford scrambles to make sure their cooling system, transmission, and suspension is capable of it so they can advertise big numbers.
Newer trucks are getting out of hand with their tow ratings. Who buys an F350 with the intention of towing more than half as much cargo as an 18 wheeler? Who buys a Colorado to tow 7500 lbs?
You're towing light stuff. Just be reasonable and there are tons of vehicles out there that would do it.