Tow mileage sucks in these trucks, however I have never towed with anything else so I do not have anything to compare to. I get about 10 when I tow, my usual load is 4000lb's.

 

Check the specs on the door for recommended PSI then contact BFG. Based upon the weight and OEM spec tires along with your 285's they can best recommend what psi to run. BFG A/T KO's can cup and/or wear funny if they aren't inflated correctly so give BFG a call.

 

Contacted BF Goodrich today and they recommended 50 PSI for both front and rear tires.

 

More pics of the truck. I've been lookin' at these tires for a week now,lol. I like.

 

I had a set of nitto terra grapplers put on my old 07 when I had it. Picked them up for about 400 bucks each (Canadian) same deal, free rotation, fixes, flats, balancing. AMAZING TIRE! Its too bad I ran the rubber to the point where they were not worth pulling off on the trade in. They were a 10 ply, rated at 80psi like yours.

I ran mine at 50psi for the 2 years I had the truck, I think it was just the balance point between being too low to hurt mileage, but too hard to sacrifice the ride quality. Whenever I put a trailer on tho, I run them up at around 68-70psi. It pulled the trailer amazing! Ya of course your going to sacrifice some ride, but face it, your hauling a trailer anyways, not to mention I think I did a little better fuel wise. However I found that if you run them at the max 80psi, the truck bounces around too much.

Its kinda funny too because when I ran them at 50psi and took the truck in for oil changes, the guys at MR lube thought I was retarted for running them up so high. I quote "dude you realize your running your tires at 50psi right? We have taken the liberty to pull them all down to around 42. That way you will not blow your tires up!"The only thing I said was read the side of the tire and tell me what it says?...Well it says 80psi max, but my boss told me tires should never be about 45. I just played with this guys mind, told him if he doesn't believe me pump em to 60. He never did but filled them back up to 50psi where I liked em.
It just goes to show you how careless some people are about tires, or what some people who put them on don't know about them.

Now I might just be off on a limb here, but can someone explain to me what the ratings on the door have on the BFG tires? Or for any other tire that never came with that truck for that matter? I have never really looked at the sticker so, I always just run all my tires at the same thing. If they are just rated P they are always at around 42. If they are E, then they are 50, or like I said 68-70 towing. Never really cared what was on the sticker...

 

those tires look nice man. I have Goodyear Wranger AT/S LT275/65/20 tires on my truck. i run them about 40 PSI. it rides a little rougher but its a truck on LT tires.

 

I have the cooper 275/65/20 on mine and I have been running them at 50 PSI for about 20000 miles now with no problems.

 

There are varying opinions on this and a lot of guys say to run what the panel on the door says BUT that panel is assuming stock size and stock load range tires.

I have never had stock tires on my trucks for very long. Of nine full size trucks I've owned (seven purchased new) since the mid 1980s, I've lifted five of them to varying degrees and those I hadn't lifted still got aftermarket tires soon after I bought them.

I have always run my tires at 75-80% of the maximum PSI listed on the tires themselves for day to day, pavement use. I've gone as high as 90% towing/hauling and I've dropped some down to just about where I was hoping they'd stay on the rim off-road at times (mostly in my much younger days, LOL).

On a tire rated at 80 PSI max this would equate to about 60 PSI, on 50 PSI max tires (like my current 35" FCIIs) this would be about 40 PSI.

50 is not bad on an "E" load tire and would soften the ride up a bit, but I'd hesitate to go much lower than about 45 or you'll wear them prematurely...