Most of the housing in Fond du Lac went up between 1938 and 1993, with the median build year landing around 1970, and across the 24 named areas that make up the service area the stock is mostly 1960s and 70s construction. That matters here specifically because steel track systems from that era are original hardware in a lot of these garages - pushing fifty years old, with wall brackets that have loosened a little more every year.
Fond du Lac sits in a climate classed as severe cold, and that's the other half of it. Repeated freeze and thaw at the slab and at the exterior wall brackets works fasteners loose over time in a way that milder climates don't produce. A track that's tight in August can have play in it by February, and a roller that was running true in fall can start walking against a slightly shifted rail once the ground moves under the frost.
With a median household income of $90,361 across the service area, most owners here choose to replace worn track hardware outright once it starts failing rather than shim and patch it season after season - which tracks with what we see on the truck, since full track sections move faster off our shelves here than single brackets.