My truck has been through more than one random roadside inspection. I don't why.
The truck just seems to be magnet for these guys.
http://www.cvse.ca/ They're cops. They have those powers + the knowledge of an actual certified mechanic.
In all the years my trucks been @ 4/6, not one of them has said anything about the trimmed LCA's. And yea, they've seen them.
The trimming doesn't affect the strength, because all that's really getting shaved down is what GM refers to as 'rain gutters'.
If the amount of trimming that has to be done structurally weakened the LCA's, I'd be worrying about they're integrity before the trimmage!