What is the purpose?

You can Permit more on a tri axle step then a spread or a tandem. You can still only go to 80k, generally, but with a tri axle step you’re not shooting for general fright.

 

Depends on your state, up here in the north east NY, VT, NH all allow 99,000+ if you have the extra axle, (MA and RI allow 99 on 5)

 

Yoi can do 120k in Missouri

 

Need to look in the front of your atlas, it will have all the state info as well as a listing for the states web site.
The state site should cover the most common questions.

 

Need to know whether you re talking about divisible load versus non-divisible loads...

 

I was lost at “multi axle. A multi axle trailer is a trailer that you will need a doubles endorsement to pull. You’re probably referring to a 3 axle step, as there’s no such thing as a multi axle stretch.

 

Mostly the wrong answer

Generally speaking you cannot permit for weight for Divisible loads such as lumber or cars or flour. There are some states that will permit divisible loads over 80k gross but not generally. Yes I know in the northwest with the right set up you can 105500 or in Michigan you can to some other gross like 150k but you can’t take a 15500 load from WA to MI.

If the load is non-divisible the you can typically permit in each state you travel through based on your axle configured spacing and the states regulations for permits.

I would suggest you do a lot more research and reading before you do anything else.