Firestone tire pressure

nano wrote:
I just want to make sure I don't set them too low.

The ole biscuits numbers are about right. I run the same +\- but will go lower in the winter if running ice and snow all the time unloaded. Your dealer is full of shiiiiii....., BUT with TPMS and a 2500 you will get the tire light if you lower the tires below the preset threshold. It's around 65F/75R psi based on the 2014 models I've had. Yours may still have the light load feature to temporarily lower the threshold. But even that is too high for empty driving iirc.
2 options, lower pressure and live with the idiot light or find a dealer or shop with witech software and change the TPMS thresholds.
You will not hurt anything running with the light on, nor will you hurt anything down to about 40/30 psi for normal unloaded driving. Noting optimum pressure is a bit higher.

My 12 Ram 2500 CTD LB CC 4x4 door sticker says 65 front and 45 rear when not towing. That's for 245/70/17 OEM tires. I can't see 265s being much different.
Towing says 75 front and 80 rear. I never run 80 in the rear. The front and rear weigh almost exactly the same when loaded with my 5th wheel. Rear is 48-4900lbs and the front never changes at 4800lbs. So if 75 is good for 4800 then it should be fine for 48-4900lbs. My tires all wear fine running those psi's.
Remember the rear is around 27-2900lbs empty so you don't need 65psi in the rear like the front that weighs 4800lbs.

I just want to make sure I don't set them too low.

See, they're telling me the rear tires should be 70 psi, even when not towing. I don't agree based on what I'm seeing.

I have a 2007 Dodge 3500 with Cummins 17" tires

Front tires....55# all the time

Rear tires.....45# when not towing 5vr
Rear tires.....80# when towing 5vr

I get 60,000 miles easily, even wear across the threads and I don't rotate tires
but I run Michelin A/T2 ----never have used Firestones


That chart is giving you the same info as stamped on sidewall of tire
MAX Load Rating at MAX PSI..........3195#/80psi

I did find this chart. Will this work for our truck tires, even though it's not "commercial"?

http://commercial.firestone.com/content/dam/bcs-sites/firestone/TBR/load-inflation-tables/mar2015/FS_TBR_load-inflation-tables_web_2014.pdf

The door sticker is also not helpful unless I want to keep the pressures where they are and keep wearing the middle of the tread.

Look at the sticker on the driver's door post.