I agree that most manufactures manuals for the trailer are very generic and almost useless. What you really need are the manuals for the appliances that are in your rig.
I think you can probably download the manuals for most of your rigs appliances from a website owned by member Chris Bryant who has his own RV repair shop,
Bryant RV Services.
Click here and be prepared with the model name or number of the various appliances you need manuals for.
Hope this helps you out a bit.:)
Barney
2004 Sunnybrook Titan 30FKS TT
Hensley "Arrow" 1400# hitch (Sold)
Not towing now.
Former tow vehicles were 2016 Ram 2500 CTD, 2002 Ford F250, 7.3 PSD, 1997 Ram 2500 5.9 gas engine