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Highly doubtful, when you cage a truck the frame is just a place for the tubes to hit, so if the frame bends on a stock truck this is not a factor in a caged truck

When you set up leafs on a truck with a bedcage you break down the leafs, cycle the main leaf and get your shock mounting point, doing this allows you to get the most out of your springs and shocks unlike the factory setting. Remember, no 2 leaf springs are the same