I know Big Rigs and I get into a loaner or other rides and hear this noise often.
Sometimes, it's only when extended to one side or the other, the screeching noise that is.
never really dealt with it before on regular cars but it's the same to an extent.
Just got mine back from our shop and they re & re'd the intermediate steering shaft as it had way too much play developed in it, nice and tight again. no more wandering. no more kissing the zipper or the gator back lines.
new windshield, new mirror backing covers, AC fixed again, 2500W Inverter installed,
some 12 volts fixed in the bunk, lights in the instrument console replaced, new fuel cap seals,
seat belt retentioner, steering wheel true centered, little horn fixed, new CB antennas,
Lube, Oil and Filter, headlights were send out for refurbish back in and aimed correctly.
5th wheel kingpin jaw free play tightned up, steering wheel rattle corrected with new nylon washer/shims, slack adjusters tightened and I'm on my way this sunday to the West of Canada for a week and half.
gotta put my seat covers, XM satelite, Kenwood head unit and 10" pre-amped Bazooka Base tube back in, hook up my 12volts gadgets and put the old 13" color TV and Xbox back in, coffee maker and toaster. stock the fridge up and I'm off this sunday late evening. Money Money Money .... good easy trip back and forth, boat load of miles,
with hotel stays and meal expenses.
Kicking it tight with a 53' trailer all day, all night ... LOL