Truck vibrates/shakes when fuel tanks are low on fuel

Are you talikin about kingpin on trailer or on steer axle ??

 

I had Centramatics on trailer but i remove them a few months ago since the were 9 years old and they were cracked. I just installed Tru Ballance sleves on trailer ones that centers drums and wheels. It helped for like 30 miles and vibration came back. One or more tires is run out. Imt thinkin buying Radial run out gauge from Tru ballance or just try to ballance all trailer tires
Even without centering sleves truck dont vibrate in the morning. It would take 10 miles to start vibrating. So maybe until tires or bearings warm up

 

Trailer is standard 2016 Wabash dry van with hendrickson Vantraax 15158 40k/20k
5th wheel is Fontaine No slack 6000 series that i rebuild a few months ago. Also changed 2 years ago when i bought this truck i changed AWB sllider from 8-3/4 to 6-3/4 because i was over 13.6". Replacement was new Fountain part.
5th is adjust to 1/4 free play on adjusting bolt just like Fountain says

 

I think it was about same. Ill measure his trailer when i get home. I know for ste his kingpin wasnt deeper than mine.
Btw my 5th wheel sitts right between axle. If i move any forward ill be overweight on steers on 45k lbs load. I tried sliding 5th wheel forward and back but still get vibrations

 

My kingpin is abuot 34.5" from edge of trailer