I have two steer tires with diff tread depths~!! emergency or what?

It shouldn't matter if one has more tread than the other all else equal.
Pulling and sliding to the right, probably is some other issue.
It is never a good thing to blow a steer tire, but I have blown 2 in my life, with power steering it is notso bad, the first one was in an old cabover with no power steering, we went for a ride that time.

 

I would be nervous going 65 hours plus, since I can't stay awake that long in the first place.

And I do not think most steer tires blow because of tread depth. Most happen from sidewall failure or from running over an object in the road.

 

Trade that new one to an O/O for his half worn out one if it makes you feel safer.
He'll probably split the mount/dismount fee with you if you ask nicely.

 

I had a cargo van and was doing the front brakes and was almost done and had it off the jacks and was tightening up the lug nuts when my brother came over and I got talking and completely forgot to finish tightning up the drivers side anyways about 3 days later it fell off going down the road , fortunately I was out in the boonies and it ended up a half a mile out in a field anyways it never shimmied or anything the lug nuts just fell off , but it really wasn't a big deal to stop and didn't do any damage

 

Take a deep breath and say "no one is going to DIE today"

When a steer tire goes grab a tight grip on that wheel, add power until she stablizes as you counter steer that enormous drag.

Back off power slowly, speed will fall. Start looking for a spot on the shoulder where it will stop. Allow her to drift to a stop. No brakes, no jake no downshifting no wild man stuff. She'll stop.

That's all you have to do. As long you don't screw that up no one will die.

On the other stuff. You do have front end issues. Have a shop evaluate it. Swap both of those tires off your steers after you fix the front end issue. Old tires go to trailer spare pile. Put new tires on there.

When we were a married team with FFE our 2000 freightliner Century was issued to us at 16 miles on the odo and we ran it on the orignal steers 221,000 miles. 10 months later we turned it in and the treads were in about 50% of life evenly. (Yokos...)

That plus the brakes longetivity was a personal record The transmission not so much, it suffered a software bricking twice that year requiring a tow (Automatic, rockwell)

 

Always use slight acceleration in curves .. your hitting the brakes and coasting through them is likely to jackknife you one day on icy or slick pavement

 

Yep was gonna mention that. Get down to the speed that is safe for the corner BEFORE you enter the corner and gently accelerate throughout it. So many new drivers are not taught this

 

You need an alignment and you probably find out why one tire is wearing more. You need a goo alignment like MD alignment, not the truck stop guys. They just do what the computers days and don't look to see what wrong. If you watch the video he talk about you problem one steer tire is wearing.

 

Within allowances.

You are taking curves, not turns. I know it is nitpicking - been accused of that a lot lately but don't care, I like accurate information.

If you are having issues with curves on the highway/freeway, it is one of four things;

1 - the tires are not inflated right **which was never mentioned in any responses I saw

2 - the truck is seriously misaligned, not just the steers but also the drives and possibly the trailer

3 - the load is not properly placed on the trailer

4 - the driver is new and not comfortable with the way the truck handles

Yes you are wrong.

Yes you are wrong, tread depth has to do with the tires' ability to adhere to the surface of the road. Other factors are involved with a blowout, primary the inflation of the tires themselves.