Good article covering the basics.
I couldn't help but notice how times have changed and peoples thoughts of what it takes to tow have changed. Could you imagine what would happen today if someone proposed towing a Porsche+spares in a ~20' enclosed trailer with a 1990 (at best) S10 Blazer/Jimmy. Let alone what GRM would hear if they showed such a rig as am example of "towing it right". I personally wouldn't have an issue with it. It would tow slow and you could easily be safe. But now and days that same load is one many a forum member have said taxes their modern 1/2 ton like a Tundra with ~2500lbs more towing capacity and literally 2.5X the HP.