Then you realize that you want full float rear. But 5 lug full float is not cheap. But hey...you can always unlock the hubs and flat tow. Then the hubs blow up. Then Warn makes a custom 35 spline hub with a special set screw to keep them from unscrewing. Then you destroy those and install drive flanges. Then you realize you could have bought a dozen GM 14 bolts for the price of 1 full float 5 lug D60...
But yeah. 8 psi is a good number. or 5 psi, or 40 psi. When you get too low, you start bruising/ slicing sidewalls.
Bigger issue is building a spare tire carrier that can hold up. And the cost of vertebrae fusion surgery from lifting them on to the mount.
exactly on the rear... reminds me its time to check my Set20's and probably replace them, seems to be an annual event, the cages break....
I run 12-15psi, unless in sand, then its 4psi. for the most part I do not feel the need to run beadlocks, I do on the bronco, but I run the same PSI on 2 other vehicles without beadlocks and have no issues or concerns, but do not make dedicated sand trips with them. Now my buggy on the other hand, 6psi is the norm, 40" tire and 4000 pound vehicle doing dumb stuff and beadlocks are a must.
That is why I do not carry a full size spare, the weight. I carry a stock size tire and wheel, less weight, easier on the back, easier on the vehicle and way better for vehicle performance. Want to get denied on a climb? carry a 180 pound spare with a 300 pound bumper hanging on the back..... remove that and its amazing how much better it works off road and drives on road. I've run the donut tire for an entire week in Utah wheeling everyday and doing lots of road miles. Looks funny but drives fine. If you have a twin stick and only use the front when needed, it doesn't load up and cause other issues. This 65 pound tire and wheel works just fine. Yes it is on the roof, but when your roof is only 5'11" high, it is not that high, it fits in a normal 7' garage door with several inches to spare. On this particular truck, the spare sits at home in the garage unless we are somewhere where we are hours from potential help. I've only needed it once in the last 30 years, but it was worth having and saved a week long trip.
33's are my limit for a full size spare, after that I want a lightweight alternative. The exception to that is my motor home, I carry an 11r22.5 spare tire and wheel on a hand winch under the truck, if it saves me a roadside call it is worth having under there.
PS: yes that GM wheel has the center bored out to 4.95” so it will fit any 8x6.5 bolt pattern hub, not just the smaller GM hub pilot.