How many axles does a semi-trailer have? What kind of axle is better for semi-trailer?

Generally speaking, a trailer with several axles. According to the purpose, three-axle trailers are used the most, and there are other special axles, some of which are professional transport trailers with eight axles and ten axles. Different trailers use different axles. General cold chain logistics, tobacco, instrument transportation, etc. Will use bpw axle, others will use Hua Fu axle, Rong Da axle and other American axles, with simple structure and good heavy-load performance.