Perhaps those that have built a number of trailers may not find Glen-L’s book extremely helpful but on the other hand, I as a first time builder, found it very informative - even more so when used in conjunction with their trailer plans. It is designed to give the builder an overview of construction and some ideas for layout and accessories. Also, it is not just geared at Glen-L boats but to any boat whether homebuilt or factory.
If you are looking for specific measurements and angles I doubt they can be found in any book type publication. The problem is hull designs vary VERY widely. There are flat bottom boats to deep Vs to displacement hulls. Although the same basic frame can be used for many, the specifics will be quite different to accommodate a particular hull.
Sure, they could give dimensions that may allow highly adjustable bunks to fit a multiple hulls (that is what factory builders do). But is that what you really want? A trailer built like that is a compromise at best. If I am going to take the time to build my own trailer it is going to be custom built to fit my specific boat. This will result in a stronger but at the same time lighter trailer. It also allows you to design your trailer to carry the boat as low as safely possible making launching and retrieving easier.
The only way this can be done is to develop the measurements and angles directly from your hull. I did this when constructing the trailer (1700 series) for my Cabin Skiff. I made templates from scrap plywood at specific locations on the hull. I simply set them on the inverted hull and screwed the strips together to form the same angles as the hull. I then used the templates on the trailer frame to develop the angles.
I had the trailer for my True Grit custom made by a company that builds boat trailers. For that the builder requested I provide the information so they could make the custom fit. Since the hull was already upright I had to get under the hull and take the needed measurements and angles and get that to them along with photos of the hull. I also need to do the calculations as to the center of gravity so the axles could be properly positioned. Although they do nothing but build boat trailers I had to give them my numbers.
I guess my point is that the book just can’t give specifics, as there are just too many variables. They could provide dozens of scenarios but odds are none would still work out as well as measurements and angles you develop yourself.