10 ply tread and sidewall is 1950's (bias ply tires)
we have moved on to steel belted (rarely more than 2 ply sidewall)
Carry 2 spares?
If your tires are too small for the job and need to be fully inflated at all times to carry your heavy truck, you will have flats often and need 2
spares.
Once you get tires with more volume of air, flats will be a part of history and one spare will do.
When I moved from 30x10.50 to 35x12.50 I went from one flat a week to no flat in 10 years
hanging two spares on your back is like mounting shovel and HiLift to your roof rack - it means you don't really know what you are doing
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