Heavy haul truck spec help needed

weight can you legally carry with that setup without ever needing a permit going into basically every state (on the interstate system) is restricted by 23 CFR Part 658.17

All of the higher limit states were grandfathered in decades ago, State Exceptions to Federal Truck Weight Limits

Here is the Fed bridge formula,

W = max weight
L = distance in feet between outside axles in a group
N = number of axels.

​

States are subject to the standard Federal weight limits for Interstate highways (20,000 lbs. on a single axle, 34,000 lbs. on a tandem axle and 80,000 lbs. gross vehicle weight) unless there are State-specific grandfathered limits...of which there are multiple over 50 years time that give 37 States and DC some higher limits but are not standard enough for what you are asking.

That is why Peterbuilt can't give you an answer, outside of 20K single, 34K tandem and 80K GCVW there isn't one.

 

Did you by any chance contact the company that makes the unit and ask them for someone to talk to who has done this upfitting for them?

 

Have you looked at a single axle drive truck with 2 pusher axles that would allow you to air adjust the lift axles to shift weight to the steering axle. A 4 axle straight truck can gross around 50,000 lbs plus. A single drive axle can carry 20,000 lbs, add in two liftable axles depending on tire selection could be 14 to 18,000 lbs on each axle. Peterbuilt should know how to build and set up multiaxle vehicles. If not ask a Mack or KW dealer. Make sure your truck is double framed. A single axle drive should work as you drive on a concrete highway, not off road.

 

I have a question how can I find out if my truck is heavy spec. I'm looking at a freightliner classic owner says it's 14.6/46 us there anyway to find out if it really is that much.

 

Call the dealer with the VIN. They'll tell ya everything you want to know.

 

The door should have a label unless it's worn out. Otherwise. Dealer.

 

Unless overtime different axles were put under.

 

In that case calling the dealer won’t be any help either.

 

Doesn’t truck need to be re rated for the extra weight if going higher than factory rating.