B Trains in the States

I really do not understand why we don't use B-Trains in the states. I don't get it. They seem way better then typical A-Trains Canada uses B-Trains a lot heck even the company I work for which loves A-Train doubles uses B-Trains in Canada and 10 Wheelers in Canada, I think the 10 Wheelers though are because Neate-Roller who they bought out had quite a few of them, must be a reason for it.

I know the "boogie" can be slid under neath the trailer and they can be run as singles. Tim Horton's which is huge up in Canada runs a huge B-Train operation. I know the weight laws are different in Canada and I know the weight law vary a little state by state like Michigan has there dirt trains and super tankers. I know California has some ridiculous trailer length law among other ridiculous laws but there's a lot of doubles and 28' trailers out in California from what I've been told. I've never been there my self.

 

It wouldn't work for everything, It seems like in Canada they use them for almost more like rail replacement like DCT Chambers uses them mostly to haul wood chips. Valley Transport of Ashland, Ohio does have a couple B-Trains for steel hauling.

 

The boogie or fifth wheel slides underneath the lead trailer just like sliding your wheels when you go to adjust trailer tandems , Tim Hortons in Canada uses a lot of B-Trains here check it out:
http://hankstruckforum.com/htforum/index.php?topic=1311.60

 

Rabbit this link answers the questions there's some really great info and pictures take a look all the way down the talk about exactyl how B-Trains are used for Box van stuff. After seeing this I was like well this makes more sense then A-Trains.

http://www.hankstruckpictures.com/martin_phippard_trailers.htm

 

I know the potato chip companies have 57' trailers in like Texas and Louisiana 57' trailers don't interest me to much ha-ha!