Truck Pulls Right - Process of Elimination?

Why so light on the steer axle? The four axle trucks I’ve ran carried 12-13k on the steer with the axle down to be able to bridge the weight. How much are you carrying on your lift? Have you checked anything on it?

 

That's too much pressure on the drop.

Can make for slippery steering in bad weather. Not enough steering pressure.

My steers only lighten up from 13200 to 11600 pounds.

 

Used car I bought was pulling right.
Bent right front rim was the culprit.
New rims eliminated the problem.

 

In your original post you said 105 gross and 50 on the trailer. I said too light because with that math of being 55 on the truck and under 10 on the steering wheel means you’re over 10 on the lift. Now you say 103 and 52 on the trailer so the math is a little better. Personally I’d want more on the steering but with a long truck and a short spread you won’t be able to do that without cutting your 7 axle bridge down too much.

As far as the pulling, have the frame checked. Have everything on the drive axles checked. If it pulls when empty that rules out the lift. What’s your tire wear like? Usually a good alignment shop can look at tire wear and know where the truck is out of whack.

 

I have had similar issues with my trucks in past including about 2 weeks ago. Similar setup but with belt trailer..

Here are solutions that worked on each case over years ....

Bad shock on final drop tag axle on trailer
Bad wear on trailer tag tire
Bad pressure and wear (not visible to naked eye) on the steerable drop push axle on tractor
Latest was an imperfection in steer tire that only had 10,000 miles on it. They couldn't find problem, we checked all tires, bushings etc for all suspension and tire parts for all 8 axles with no solutions.... Just we decided to just replace both steers .... Problem solved

 

Everything above, but I have noticed running a regular tanker, my rear drive axle over the last 120K miles (last year of driving), has moved half an inch right as opposed to the front drive axle. I don't know how it happened, but it did. I guess I did it, because I'm the only one who drove the truck.

8 foot straight edge against your tires can tell you a whole lot, and doesn't cost much. Hell a straight 2x4 would work.

I'd start with the tractor before I started blaming the trailer.