1990 Ford F-150 — trailer is within ratings but feels nervous in crosswinds

Cleared nothing. I want service to see the alert on the 1990 Ford F-150 first. If that fails I'll eat the diagnostic fee.

It did 150 — trailer is within ratings but twice this week, both times after sitting. No change in mileage feel. I'll update if anything new shows up.

Log the conditions before you spend. Capture voltage while the 1990 Ford F-150 is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. On “150 — trailer is within ratings but,” that was the fork that mattered for me. That's the sequence I'd use. Climate here is different, so treat that as a local data point. Not driving it hard until I know more.

Start with the test that can prove you wrong. A pressure test beats staring at a dry driveway if the 1990 Ford F-150 is losing coolant with no puddle. That's the branch I'd chase this week. Have you gotten a second quote in writing? Checking again after work.

Log the conditions before you spend. Swap the cheap/easy piece first on the 1990 Ford F-150 and see if the fault moves. Save the big job until that test fails. On “150 — trailer is within ratings but,” that was the fork that mattered for me. Any freeze-frame data saved? Parking it somewhere I can hear it better next time.