Question on a lift axle

permit will tell you,most of time I leave mine up.

 

How much weight are you running on the trailer? How many axles on trailer?

 

For Montana, if possible I would try to put some more weight on your drives and run the pusher down. The permit will be greatly cheaper, easier and faster to get. Do you have a vehicle analysis for Montana, so you have weight conditions? If not I would get one. North Dakota will depend where you are going or coming from? If not on any of the route with load restrictions you will be fine.
reduce trailer weight

 

Your bridge formula is figured by how many axles are on the ground. I.E if your running 7 axles and can gross 97,000 and you somehow get your axle groups legal with your lift axle up, you will be in a 6 axle bridge overall instead of 7. You can't bridge 97,000 with 6 axles even if you have a 20k front end 34 on drives and 43 on trailer. Unless your talkin non divisable like heavy equipment.

 

I don't know of any state that would allow 56 on 3 axles unless it is non divisable. Guess I dhould have paid better attention. Sorry!

 

There was something in Overdrive mag a few months back (Spec'ing your next truck). I thinks it covered a few issues but, I remember them referencing a few western states that allowed higher weights based the spread of trailer. Don't quote me but, i kinda remember a spread axle trailer getting close to 90K in a few western states.

I'll edit with a link once I find it.

 

Heck, If your only gonna be 34 on drives, lose the lift axle.