What are the weight limits on doubles and triples trailers?

On states that allow triples, 105,000 on 7 axles. Trailers used for doubles/triples (pups) are 28 ft long. You can gross 34,000 on a pup with 20,000 allowed per axle max, however, if you have 20,000 on one axle you then can only have 14,000 on the other. Ideally, you would weigh 17,000 on each axle (34,000 gross per trailer). A single screw power unit will max at 17,000 on the drive axle and 12,000 on the steer. Some LTL carriers have "long" pups with single axle that seem to be about 32 ft long usually with a liftgate. These units are NOT part of a set of doubles.

 

I may have messed up, a set of triples should be able to gross 115k, not 105k. That's 17k per axle X 6 axles plus the steer at 12k. I think the length limit is 105 ft. Going off my memory from living in Idaho early 80's. We did sugar beets with twin screw power and tandem trailer and a pup with single axles and long draw bar. Total of 7 axles, 105 ft long grossing 115k.

 

Yeah OK, 105,000 lbs on 7 axles.