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Ditto on the fluid changes and filters. The ones most neglected are the tranny and coolant. If the coolant hasn't been changed every 3 years for ethylene glycol (5 yrs for DexCool), consider swapping out the waterpump and look for radiator leaks due to corrosion. I might at least replace the rad cap and consider having coolant tested before oil, as there is less other hint of something gone wrong.
Same goes for the fuel pump, another item that does not outlast the drivetrain. One other fastwear item on tow vehicles is the alternator. On my old ('76) Chevy/TC, I used to carry a spare set of Delco brushes and needed to swap them out about every 30k miles (took 15 minutes). One of the pertinent reasons is the extra lighting and camper battery. On a tow vehicle, the starter with few "starts" may not work too hard if the engine fires easy, but the alternator works extra hard, mile by mile.
I just swapped out the alternator on my Excursion ($238). My intent was to merely replace cheap brushes, but these alternators are notorious for damaged slip rings and, sure enough, one brush had broken and already cut a deep V groove. A local Ford dealer didn't have a reman' one in stock, but had it delivered while I waited. Good thing it was during Bankers Hours. Back at 118k, the starter quit contact whenever it was too cold (-10F). Proof was when it worked perfect after applying heat. That was $200-300, I don't remember. I've had them not work well when too hot before, but "cold" was a first.
One might consider replacing the battery. Spare bulbs, all fuses, belts and a second spare tire for trailer + truck aren't totally unreasonable if one has room. With only one spare, one is flying rather au naturel after the first flat, maybe in the boonies at night, a weekend, a holiday. Truck tires are somewhat easier to find than trailer tires, especially in the midwest.
All these are things that don't last as long as the original drivetrain.
Wes
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