If you have seen a 17', I wouldn't worry about seeing a 19' and ordering one sight unseen, assuming the TV is no problem. Many have done just that, in fact, some never even saw an Escape beforehand.
If you have seen a 19', however, I would not go the other way and order a 17' without seeing it. I would say that you would need to see if the 17' is big enough for you.
Seeing a 5.0, of course, is another deal altogether.
One of the main considerations on the 19' for many is the tandem axle which allows you to go down the road miles from where you might have a tire blow out to have it fixed in a safer place. Others don't want to pay for the upkeep of more wheels or tires.
Cathy. Floating Cloud
"Live in the sunshine, swim the sea, drink the wild air.... "