Triaxle trucks

doing a log book should be something to learn before the trailer specs, ???? where's your head at ??

 

Generally, the GVWR for a tractor-trailer combination is 80,000 lbs. In most states this doesn't matter whether the trailer has two or three axles. In most states you can order overweight permits. and through the permit you can be allowed additional weight based on things like number of axles, tires per axle, width of tire, etc....

The states (and Canadian provinces) vary on this. some states allow more weight without permits with extra axles. Some states you can purchase annual permits for certain goods. It's a big beautiful mess really. But until you really want to figure it all out, just keep in mind 3 axle truck, 2 axle trailer = 80,000 lbs. and you are limited to 12,000 on the front axle, 34,000 on the drive axles, and 34,000 on the trailer axles unless they are spread axle and then you are allowed 40,000 but you still can't exceed 80,000 total. and that is pretty much nationwide except for California, where you have to take into account some measurements between axles.

 

If you have an oversize permit it would depend on the state... In the state of Colorado, with an Annual Permit, a three-axle drive grouping (whether tri-drive or tandem drive with a pusher axle) you're legal to have 70,000lbs. on that grouping. With a three-axle trailer you can have 65,000lbs. on the three-axle trailer grouping. If you figure you're carrying 13,000lbs. on the steer, you're legal to gross 148,000lbs. in Colorado with a 1-3-3 axle arrangement with the Annual Permit, IF you can get all of your axles to scale right.

You won't be permitted that heavy for a one-time permit, however, most places it seems as though you can always run heavier on the annual permits.