Sorry, can't help, but few RV manuals are very comprehensive or even specific to a given model. Most RV manufacturers don't send much time or money on owner manuals.
There are a couple Alpenlite 5W manuals available online, though not your specific one.
http://specialistsrang.weebly.com/blog/alpenlite-5th-wheel-owners-manual
https://evenclosom.files.wordpress.com/2015/10/alpenlite-5th-wheel-manuals.pdf