Nice write-up. I just purchased a new to me 2010 Jayco 17z. I have not used or tested anything yet, however I noticed the same as you mentioned, the converter/charger is in the rear & the battery is all the way up on the tongue. At this point I don't know the type of charger or gauge of cable used but I will be checking & adjusting this as need be. I'm hoping to do a dual battery system. I'd like to move the single 30lb propane tank forward on the tongue to where the single battery is & then in the wider space between the A-frame behind the propane tank, make a new shelf & box to fit 2 batteries. I have to be careful considering the GVWR of the 17z.
I did notice in your write up you said "I’m not clear why they call the Chargers in RV’s Converters" but then below that you said "It takes the 120V AC household power from your plug in and converts it into nice, battery friendly 12V DC power"
You answered your own question. They perform 2 tasks, converting AC to DC & sending a DC charge to the batteries. I guess primarily it's a converter & secondly it's a charger so they just picked one & called it a converter.
But great job on your research & willingness to share this knowledge with others. Something to add to your write up eventually would be converting DC to AC using an inverter. Many people aren't aware of the draw this creates on batteries because when converted, 1A AC = Approx. 10A DC. Don't take long to drain a couple batteries.
Here is a post where I was trying to help someone out with this very issue. http://www.jaycoowners.com/showthread.php?t=6378&page=2