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Your question is a bit more ambiguous than you realize. Without taking into account what state(s) this vehicle is/are operating in, whether any permits are in effect, etc., the simple answer is that the combination would be limited to the same 80,0000 lb. gross vehicle weight as any other tractor-trailer is. 34,000 lbs. on the drive axles max, steer axle may have up to 20,000 lbs on it.

If you want to know what the weight limitations would be in accordance to the federal bridge law, see the related link at the bottom for a source where you can calculate it, but bear in mind that, if that is a 38 ft. trailer you're working with, you'll need to replace the given bridge measurement between the drive and trailer axles with the distance between the drive and trailer axles of your vehicle.

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Q: What are maximum weight limits per axle on a 3 axle semi truck and a 38 foot tripple axle lowboy trailer?
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