[JRTJH]

The biggest issue that I see with changing "frameless windows" for "frame type windows" is the radius curves in the corners of each different frame type. You'll need to find windows with a "outside flange" that will cover the radius cutout of the frameless windows. Typically, the frameless windows have a larger flange (glass + aluminum frame) than the flange on the "conventional windows".. When you take a "deeper or shallower radius" and couple that with a smaller outside flange, many of the "conventional windows" that measure the same size won't have a flange that completely covers the corner radius of the trailer cutout opening....

In other words, on many types of windows, if you switch the style of window, the new ones either won't fit the corner radius or the radius is too big for the new windows, even though they measure the "exact same size" as the ones you took out.