[JRTJH]

If you go inside the trailer and look at the window frame, both the "frameless" and the "aluminum framed" windows have an aluminum frame. The difference is what you see on the outside. On the aluminum framed window, the frame is attached to the trailer wall with an aluminum flange. On the frameless window, the aluminum frame is attached to the trailer wall with a glass flange (so you don't see the aluminum frame). Otherwise, the windows are essentially identical in actual "glass inside the aluminum frame". There is an "appearance of more glass" on the frameless windows, but from the inside looking out, it's the same "glass surface that passes light".

There have been some significant problems with the bonding of glass to the aluminum frame on "frameless windows". It's mostly related to the glue that holds the glass to the window frame. On the aluminum framed windows, the glass is secured with rubber moldings, a much more reliable means to keep the glass from falling off the trailer.

It's your choice, possibly your dealer can find a trailer that's on a lot somewhere with the frameless windows if that's your preference, but realize that it won't be a "new trailer, fresh off the assembly line" but one that may have been sitting on a lot with a number of people walking through it, twisting knobs, jumping on the floor, soiling the upholstery and carpet and who knows how long the sun has shined on those "less than great" OEM tires.

ADDED: Dealers don't get to pick and choose how a trailer is assembled by Keystone, so don't assume that your dealer is doing a "bait and switch" to make more money from your sale. Keystone does "reserve the right to make mid year changes without notice" and that information is in a disclaimer found somewhere on every trailer brochure. I wouldn't believe that it's some kind of conspiracy between the dealer and Keystone to "bilk you out of your money".....