This is not a great picture but it is what it is. This is from a gable roofed building that is a couple of decades old. The ridge has sagged. The kneewall is 18" tall. Sorry, no data on building width or anything else.
(https://i139.photobucket.com/albums/q305/djmbucket/construction%20oddnends/crackedkneewallstud.jpg)
Outward thrust?
Yes, regular rafters set on an 18" high kneewall and no real rafter ties.