get out and kick some tires- many youtube videos from dealers do a great job of showing layout, features and you can see how easy ( or not) moving around the van is.
the RT versatile is a 4 seat w/ sideways sleeper- how tall are you?
the RT popular series is a 3 seater & sleeps fore and aft..so better for taller people.
the 2nd row seats may not be near as comfy as the front seat...some remove them and add a cabinet or just for more room by the door
these models may a be a little "claustro" as the cabinetry makes it feel close
( I know nothing about the travato)
the 170 is shorter than the 190- the 190 has extra room and is same width height pretty much- the 190 may have a stronger chassis and larger motor option, depending on year.
RT has older brochures and manuals on the website- nice if you are shopping used
we travel 2+dog in a 2006 Pleasure-Way Lexor TD built on a Chev 3500 chassis. I prefer a GM chassis- i know how they work
it is a gem. 2 swivel seats up front, 2 benches in the back make to a queen...or leave out the bolsters and 2 singles. we find we leave the bed made up as a bed all the time.
models with an enclosed toilet chew up alot of space...we only use or toilet for liquids, no solids- not even paper. reduces the chemistry experiment.
using it offers privacy just by opening the doors to 90º ( which on the PW latch)..it's just the 2 of us.
These latching doors can also offer rear privacy is stopping for a quick nap- no need to close off the cabin, just open the door and click it into the latch.
we don;t use the shower...many models come with outdoors shower option- we use that for us, dog, muddy boots, cleaning fish.
anywhere we are that is remote and doesn't have showers...is remote enough we can shower outside.
also a 2 sink is nicer than a single sink w/liner which some RT's have
every B is a pile of compromises, see what matches your needs best.
a "van" makes a little more stealthy when traveling and may pass muster if you are visiting someone who lives in a HOA.
whenever I call for reservations I describe it as "campervan" not "motorhome".