<Tr> <Td> 37 </Td> <Td> 40,000 </Td> <Td> 60,000 </Td> <Td> 66,500 </Td> <Td> 71,000 </Td> <Td> 76,000 </Td> <Td> 80,000 </Td> </Tr> <Tr> <Td> 38 </Td> <Td> 40,000 </Td> <Td> 60,000 </Td> <Td> 67,500 </Td> <Td> 71,500 </Td> <Td> 77,000 </Td> <Td> 80,000 </Td> </Tr> <Tr> <Td> 39 </Td> <Td> 40,000 </Td> <Td> 60,000 </Td> <Td> 68,000 </Td> <Td> 72,500 </Td> <Td> 77,500 </Td> <Td> 80,000 </Td> </Tr> <Tr> <Td> 40 </Td> <Td> 40,000 </Td> <Td> 60,000 </Td> <Td> 68,500 </Td> <Td> 73,000 </Td> <Td> 78,000 </Td> <Td> 80,000 </Td> </Tr>

What is legal weight of a tractor trailer