Dexter Axle's statement; "Ideally, the tire footprint will contact the road evenly across the width of the tread", and looking at Dexter Axle's associated axle assembly diagram implies that the axle under load will straighten out. I don't know if it's perfectly straight, or if this only happens at it's specified GAWR.
Source: Prior posted Dexter Axle links.
Interesting subject matter to say the least
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)