Proper Tire PSI?

[jgruberman]

Can someone lend me a hand with the proper formula for determining PSI based on load?

I have the weight ratings of my vehicle, the boat and trailer I tow, and the tires themselves.

I'm just not 100% on how to determine the PSI.

Not necessarily asking for someone to do it for me, but I've seen the tire load charts, and they're confusing.

GVWR: 10,000
Payload: 1,890 (Payload = GVWR - Base Weight - Driver)
Base Weight: 8,114
Front: 4,994
Rear: 3,120
GAWR:
Front: 6,000
Rear: 6,500
GVWR: 25,000
Trailer + Equipment Max Weight: 16,720

Tires:
35x12.50R20LT, Load Range F, 125Q
Max Load: 3640lb @ 80 PSI

Boat Trailer:
GVWR/PNBV: 5440 LB
GAWR(each): 2720 LB
Max Load: 4340 LB

Boat Package Weight:
3520 LB

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[jgruberman]

Following up on this, I have been trying different calculators and found online that none of them seem correct.

Also, I'm not sure which weights are the key ones to consider for determining proper tire inflation.

Again, I'm not necessarily looking for anyone to do the math for me but for someone to at least explain what the formula is, we'll start plugging in the correct values when I understand what it's looking for

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[Corkey]

If you need to adjust for differences in the pressure or weight between the charts, you can do it using this formula: Tire weight/tire pressure = Load capacity pounds per psi You would start with the load and pressure closest to the original tire, adding or subtracting to find the proper adjusted pressure.

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[jgruberman]

If you need to adjust for differences in the pressure or weight between the charts, you can do it using this formula: Tire weight/tire pressure = Load capacity pounds per psi You would start with the load and pressure closest to the original tire, adding or subtracting to find the proper adjusted pressure.

Sorry I missed this reply, my mistake. My problem is I'm not sure how to read the charts. I get the weight is per tire, but what is that weight encompassing? It might be easier than it seems but it seems pretty confusing for me... I still haven't been able to figure it out and it's eating away at me not being able to figure it out LOL

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