Definitely check reference photos of the M18s in combat use, to see what was actually stowed versus the imagined accessories--there can be a big disconnect.
Some of that was the post-'45 use of the Hellcat by other nations. And post-war French stowage will be different than late-war US storage.
As a general rule of thum US WWII armor troops would have had their packs and belongings on "their" track as a rule. Open-top vehicles will have the tarp to throw over in case of rain. The TDs often operated from "ambush" sites, so they may have had camo netting as prominent stoawage.
From (potentially faulty) memory, the TD Companies operated out of Company or Battalion operating 'bases.' So, much of the gear that a "pure" tank Company or Platoon might strap to the track could be back at that "base."
That comes from ouw the Armored Divisions often held the TD units at the HQ, and moved them forward as needed so they might spend time "in the rear with the gear" rather than posted out near the Forward Edge of Battle.
Units closer to "big brass" often have to be neater and more "by the book" than ones rotated to the Front.
So, photos can be a better place to start from, than catalogs.