Weight limits

Spread axles, like what u see most on flatbed allow more weight on the trailer. Still can't be over 80,000 but allow 40,000 on the trailer instead of 34,000

 

As for tractors with a 3rd axle, I'm not an expert on it so someone else can answer that.

@Hurst @TripleSix

 

@Dye Guardian, show him a picture of the B Train.

 

Extra axles on tractors and trailers that raise and lower are for load restricted roads that weigh by the axle. You see a lot of them in ND, MT, ID, WASHINGTON etc.

 

Now, that's a complicated question. You've probably noticed that the states that border Canada allow for much heavier setups provided the truck meets their bridge requirements and tire ratings.

"Can you explain the 'bridge' thing, Six?"

Will try to. If you could imagine a truck and trailer, truck has 3 drive axles and the trailer has 5 axles...the truck is the same size as a 244wb truck and the trailer is 48 ft long. The problem is it would be a lot of weight concentrated into a small area. But if you SPREAD out the axles, which of course would neccitate a much longer truck and trailer, and put that weight on a much larger area than a regular truck, they will allow you a much higher axle weight.

 

Don't forget the frost law.

 

This is Rontonio's rig. Empty, he should be pushing 90000 lbs. Anyways instead of looking at this as a truck and 3 trailers, look at it like a truck and a trailer with 2 really big spreads, to spread a lot of weight out into a much larger area to prevent damage to the roads and bridges.

It's like having a 6 axle tractor with a spread pulling a 5 axle trailer with a spread. Same concept of @w.h.o's rig, just spread out more.

 

Sure thing!