I agree. I believe these are minimum standards that get set. 80 PSI on a LT tire that falls into load range E all seem to have the same load rating. 3,750 which is why I posted that chart. I contains nearly every single size tire with the range of tire pressures and their associated load ratings.

Looking at size 275/65R20:

The cheapest tire at TireRack for the Super Duty is the Sumitomo Encounter Highway Tire...$189...max load is 3,750
The most expensive is the Goodyear Wrangler Duratrac in on/off road commercial traction...$334...max load is 3,750

2 completely different tires...same load rating.

Common sense would suggest that one of those tires has an actual (unpublished) higher load rating that the other at 80 lbs. But which one?

Tire manufacturers engineer and construct tires to meet their own personal standard as long as they meet a specified minimum.

 

 

This is exactly what I do in the winter, and 80 in the summer when I'm hauling the camper. I know I'm close to that thresh hold for the TPMS.

 

60 front & rear when empty. I just push the "OK" button after it starts...and I ignore the low tire symbol on the dash.

 

 

 

All LT tires are commercial tires as the Michelin book says.

 

 

I was refering to this statement on inflation charts

 

70 psi in the front
55 psi in the rear when I'm unloaded
Forescan TPMS set to 55 psi all the way around
Truck stickered for 65 psi front / 80 psi rear from the factory.

 

 

I'd run 60 front and no more than 55 rear (even with the sand) -
or there abouts - I'd be in that range (60-65 front) and (55-60 rear) and you will be fine. 700 is decent amount of weight in rear which has its pros and cons as has been discussed on here. My personal opinion only--- barring an application like plowing where you are putting weight in the back to counteract the weight on the front - you have to be careful, weight can help and hurt, especially too much. 700 - 1000 hanging in the back is snow plow weight territory. I'd be no more than 500, and play with the pressures. Let the tires and studs do the work they were designed too - the more weight you add the more you have to stop and on a turn if the rear starts to slide, you have that much more momentum helping to swing you around even more; and you are pulling weight off the front.

 

 

x2 haven't noticed any ill side effects , rides way nicer