Brakes.
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For a trailer with a Gross Vehicle Weight Rating (GVWR) of 1500 pounds, it must have a properly functioning brake system if the actual weight of the trailer exceeds 1500 pounds. This is an important safety requirement to ensure that the trailer can be safely controlled and stopped, especially when carrying heavier loads.
In the United States, a driver operating a vehicle with a gross vehicle weight rating (GVWR) of over 26,000 pounds towing a trailer over 10,000 pounds, is required to have a hazardous materials endorsement to transport more than 119 gallons of gas. Without an endorsement, drivers can typically transport up to 119 gallons of gas in non-bulk containers for personal use.
A fully concrete truck GVW can vary by model/state with weigh up to 91,000lbs(frieghtliner 114sd as an example). They usually have 10 tires and most concrete trucks have wide tires to prevent sinking in mud,etc. There is a paper by the road-transport-technology.org that states avg/max psi by tire type was as follow: They found -dual 11r24.5 tires had a 98 avg/175 max psi contact pressure when filled to 105psi -single 385/65r22.5 tire had a 131avg/255 max psi contact pressure when filled to 130 psi.