In reference to Cougar "travel trailers", there's a distinct difference in exterior appearance (front-cap design) between the Eastern-built X-lite Series, and Western-built 1/2 ton Series.
Lengths & weights can also vary slightly between east/west, due to the front-cap. Construction factors & components would otherwise be identical.
Unless Keystone's policy has recently changed - dealer's can order from either plant (Oregon or Indiana) 'IF' they choose to do so.
19RBE (L-shaped sofa/slide, and molded front-cap)
http://www.keystonerv.com/cougar-xlite/
Shipping Weight 5225
Carrying Capacity 1175
Hitch 560
Length 24' 1"
19RBEWE (U-shaped dinette/slide, and smooth front cap)
http://www.keystonerv.com/cougar-half-ton/
Shipping Weight 4787
Carrying Capacity 1613
Hitch 540
Length 23' 6"
Hope this helps & have fun shopping.
Terri, the Chevy co-pilot