Welcome to the forum.
Not having a manual, you are spared the disappointment of finding them useless.
Start your own manual, go to each appliance mfg website with the model/serial # and get a copy of their owners manual--will be much better than anything Thor would have provided. If you surf some of the internet forums, you should be able to find an owner with the same or similar year/model to help you.
If this mobile tech is as good as his recommendations sound, keep him handy, his knowledge will be priceless in the learning process.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired