Lichtsinn RV has a lot of good Era videos on YouTube. Here is one for the 2012 Era - I didn't watch it all the way through so I'm not sure which model or models it covers. They do have some for the 70X which you can search for.
We have a 2016 Era 70A and much prefer that layout with the beds by the rear doors running the length of the vehicle, as opposed to a bed that's oriented side to side. With the 70A layout either of us can get up at any time without potentially having to crawl over the other.