they have been known to bend mate
but before condeming the arm, have a look at the bushes to see if they are farked
there areother thngs to check as well, like the beam mounts or that the bearings haven't given up the ghost which would be more likely than bending the trailing arms, but with a lot of cars i'ev seen, he spring cup tends to retain a lot of dirt and muck and a few of them have rusted through here which has led to them being binned