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Most people try to get more negative camber, not less. So they're lengthening the LCA or shortening the UCA. But unless they're trying to stance the car, which has its own requirements, they're not changing it by a lot. A few millimeters, probably. While yes, that does put a little bit of tension on the trailing arm, it's not that much, and that's what bushings are for. As far as why LCAs are used vs. UCAs, it's because the LCA is easily adjustable and doesn't require you to disassemble the suspension, even if it does require a toe adjustment as well. RacerX makes an adjustable UCA if you want one.
As far as why trailing arms are available, it's because people will spend money for them. The OEM trailing arm is fine for most usage; it just doesn't look cool. I would love to swap all my rear suspension bits for Cusco or SPL so they'd all match and be pretty, but that's a lot of money spent unnecessarily. If you're doing something where the OEM arms are no longer sufficient, like airing out your car to sit on the ground, then there are plenty of options to choose from.
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