You need to check out that cable to see if you have a broken pulley. The previous owner may have adjusted the cables too tight thinking that the top and bottom rails should be even when the top is raised and this can break a pulley, a cable or damage the rail at the cable attachment point. Any of the above damage could cause that corner to be lower than the other 3 corners and distort things enough to cause the support to hit the fridg. On my HiLo, in the area of the bathroom and the fridg, the vent pipe telescopes into itself and if it got bound when lowering it could cause the crunching noise and maybe shift the top enough to cause the support to strike the fridg. Not knowing your layout this may not be a factor on yours. Let us know what you find.
Jim L & Faye
2003 Silvarado diesel crew cab
2017 Silvarado, crew cab 1500 6.2L gas w/ 8 speed tranny