A couple of these links were included on another forum that I monitor.
http://canada-buysellrv.com/TowingTips.asp
This a short towing guide that has some good information, but 1 section I can't quite decipher. It also includes the trailer length/tow vehicle chart that is sometimes used on this site.
http://www.toyota.com/pdfs/towguide_Part1.pdf
http://www.toyota.com/pdfs/towguide_Part2.pdf
http://www.toyota.com/pdfs/towguide_Part3.pdf
These 3 links provide some detailed explainations on many towing terms, hitches, weight ratings, and such.
https://www.fleet.ford.com/showroom/...9RVTTguide.pdf
This used to be the old standby, but I think the Toyota links do a better job with the basics......and I am a Ford guy.
The 1st part is about their products and ratings, but near the end of the pdf they get down to basics.....but still not in detail like the Toyota pdfs.
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS