Anyone tell me what states allow tridrives.....

I'm pretty sure they are accepted everywhere and most states like them better as they are common air and can't be adjusted for weight.

 

I definitely would contact the states you want to run. I used to run mine from Wyoming to Texas all the time and as Far East as PA.

 

I've never heard of any state not allowing them.

 

I thought Cali didn't allow them. Can't remember where I heard that, but it's in the back of my mind somewhere...

Manitoba used to not allow them unless they were under load. We had one break down and they would t allow it to bobtail into Winnipeg for repairs. Had to tow it both ways, can't understand that one.
"May" not have been the Tri-drive, but the overweight steering axle, I know I used to have a lot of trouble with that a few years back

Other than that, we run them pretty much everywhere else.

 

They have... some. Google "Heavy Truck Weight and Dimension Limits for Interprovincial Operations in Canada" You're looking for the December summary. "Tridem Drive Tractor Semitrailer" has been added as category 1A.

 

I don't know of anywhere in the US where you can't run tri-drives. I would think most states would prefer them in a way, at least the all equalize across the group.