Wheel alignment angle as in the wheels not being perpendicular to the ground? ie inward at the top, slanted as viewed from the back?

I have a parts car with decent trailing arms. Problem is getting them off seemed to involve a bit of creativity/leverage removing the mounting bolts (not much clearance) or just removing the entire rear subframe. Seemed like a lengthy project I can definitely do, just not really ambitious about it. There is rust on one of the trailing arms, but not in a location that would make that sort of sound, unless the rust is somehow warping the motion of the arm as the car goes over a bump.

My other car (300TD wagon) is generally in better shape (minus the pending crankshaft seal replacement) and so I may just put the sedan aside until next spring/summer, and only use in emergencies. At that point I may as well swap the entire subframe and eliminate any rust issues.