Case file LinkedIn Crossclimb #787: 4-letter ladder, 5 middle exhibits, combo prompt "A compound word for fixes to the outside of an automobile.". Endpoints: BODY (top) and WORK (bottom).
Middle phase answers: "Like fish that you have to be careful eating" = BONY; "Connection between two things that may be “common” or “covalent”" = BOND; "Like some farewells" = FOND; "Cross a river in a shallow place, or automobile company that produces the Mustang" = FORD; "Microsoft application for preparing text documents" = WORD.
Ordering phase: the valid middle chain is BONY → BOND → FOND → FORD → WORD. This permutation is the only valid one-letter chain for these answers.
Evidence link: BODY → BONY. D→N at the third letter (BODY → BONY).
Evidence link: BONY → BOND. Y→D at the fourth letter (BONY → BOND).
Evidence link: BOND → FOND. B→F at the first letter (BOND → FOND).
Evidence link: FOND → FORD. N→R at the third letter (FOND → FORD).
Evidence link: FORD → WORD. F→W at the first letter (FORD → WORD).
Evidence link: WORD → WORK. D→K at the fourth letter (WORD → WORK).
Verdict: BODY → BONY → BOND → FOND → FORD → WORD → WORK satisfies every one-letter constraint. The combo clue "A compound word for fixes to the outside of an automobile." describes both end words together — "BODY" and "WORK" each differ by one letter from their adjacent middle rungs and satisfy the shared top+bottom prompt.