😉most semi trailer trucks = 18 wheelers have 5 axles of which 4 is LOAD BEARING!. So 27.000 / 4 = 6.750 kg on each axle even if the rig itself is a few thousand kgs i guess you would need a mega armored-heavy rig to get over say 10 ton on each axle. i remember driving back in the 1970s-80s seeing a few 8 ton limit gravel roads and wooden bridges.. but nowadays almost all new roads are 10 ton + which mean you can have max10 ton on rolling-stearing axles and up to 11,5 ton on the DRIVE axle if the motor pull on only 1 of the 5 axles on a rig.