Buliwyf
Viking with a Hammer
Buliwyf- Do the Ford "Triton" gas engines (5.4, ?, V10) still spit out spark plugs on a semi-regular basis? I know the older ones were prone to that. We have a "V9" in our shop right now. I know a heli-coil kit or similar will fix the problem but it isn't a fun job to do. Have they changed/modified the heads on the newer Tritons?
As for unit bearings, most trucks equipped with them have after market kits available to convert them to conventional wheel bearings. The kits are not cheap, but similar in price to the unit bearings they replace. If you like a truck that has units, just keep in mind the kit option when your bearings fail.
The older 2v Fords need the plugs torqued and installed properly, the sooner you can pull them and get fresh plugs installed properly, the better. There are many shade tree mechanics that shouldn't be allowed near aluminum heads, especially the early Ford heads.
The 3v Fords have a problem with plugs that can't be removed. Any decent Ford dealer can fix these easy. Napa has a tool kit to extract them now. If the threads in the head get damaged, there are "Zerosert" kits that allow you to cut new threads and install a steel insert. A borescope and air compressor is needed. Don't even need to remove the heads.
With either engine, if you can find a competant Ford Master Technician, problem solved.