For the road, don’t guess or expect to get an accurate answer from anyone else - do a chalk test which will give you a good answer for your specific rig.
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For the road, don’t guess or expect to get an accurate answer from anyone else - do a chalk test which will give you a good answer for your specific rig.
"Light weight build" is fairly subjective, and unless anyone else has run those exact tires, they're just guessing same as you would be.
Tire casings are not all the same, ply rating wont even be a real good determining factor in how a tires sidewall will flex at different psi.
A good start would be the method @NashvilleTJ suggested for onroad driving. That psi will give you a baseline from which to guestimate where you want to be for "service roads". Hard off roading, rocks and ruts is going to vary on the amount of traction the particular terrain offers up. The lower the availabe traction the lower the psi. Another factor that plays into attaining the propper psi is rim width to tire width. On a wider rim pressures wil typically be higher, to have the same contact patch (with the same tire), than a narrower rim.
Hard for me to say as I've never wheeled with 33" load range C tires, and I've never seen anyone with those coopers...
All that said I usually have people that I haven't wheeled with, that I don't know their vehicle weight, and have tires I'm unfamiliar with start around 12, look at how much the tire is squatting, see how their traction is and go from there. Most people I know run 3-4 psi lower in the rocks than on just a forest service road, but again tire/wheel/weight/etc. are what determine it... on more difficult PNW trails with slippery wet rocks and tree roots I rarely see anyone above 10 at the end of the trail, unless they are stubborn and like being winched, or are in a very heavy rig (4 door with all the smitty built extras - think 6-7k lbs minimum.)
I know you're just looking for some advice, and I know it can be frustrating getting vague answers, but this really is a case of find a starting point and learn from experience with your own setup.
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