I prefer the steel spare tire rims for the reason I can flip them over and have the valve stem facing down. This makes it so much easier to not only check the tire pressure but add air to it.
The aluminum stock rims dont seem to flip as easy as the steel ones can. Granted, the steel rims need sand blasted and expoxy painted every once in a while and if they get too bad they will need replaced.
So its probably more of what's best for the owner of the rig. ;)
Being tire pressure sensors systems can be easily added now one could always monitor the pressure of the spare tire as well.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html