Like Dan says, the owners manual is not much help, rather a collection of various booklets including manuals from the fridge, wheels, axles, furnace, etc. They outdate rather quickly and you can probably find more useful info from the internet web sites for the particular component, you may find some of the companies are out of business or taken over by other companies over the past 12 yrs.
There are many here with helpful information with problems and issues that may arise, and makes this forum a useful resource when you encounter problems.
If it helps, my trailer is a 23 ft Wildwood, and my tape measure covers the entire front to back of the trailer houseing unit, not the bumper and not the tongue/hitch
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