How about if manufacturers set up a simple fill in the blank style towing website rather than a big booklet of tables with multiple footnotes?
You input the numbers from the trailer and it leads you to acceptably optioned trucks or if you have the truck, it can reverse and spit out the trailer you can tow.
It could even come with warnings...example: if a trailer will leave you with less than 600lb of payload, a warning could pop up that you only have X payload left with this trailer, so passenger, cargo and bolt on accessories must be limited to X lbs to stay within payload ratings.
Again, this isn't 30-40yrs ago when getting this info required you to go down to the dealer who would look it up in a paper book.
