Why bother with the extra trailer? There are plenty of 3 and 4 axle trailers in Ontario and Michigan. The ON spec is either a tridem or a tandem with a single steerable lift axle. Quad trailers use a tridem with a single steerable lift. MI loads often run on 4 axles (2 lift, 2 fixed) spaced 9 feet apart.
I don't know if this would be California legal though.
California allows the doubles to be more than 28'6" also the scales check axle weights and many times allow over 80,000# as they don't add up the weights. Now when the doubles are often dropped in the field for loading, the landing gear does not have a lot of weight on it like a larger semi trailer would have while dropped.
The B-Train set just pulls easier as the converter dollly is eliminated, so backing is possible.
Now since the trailer tandem axles are not 36 feet from the drives, the weight is reduced according to the bridge law. I'm not sure, but the gross weight might not even allow 80,000#.
12 on the steers, 20 on the drives, 20 on the rear trailer axle and would need 28000 on the tandem axles. Need to check the bridge law on that one.
I travel to Spain at least once a year, I'm due to go there this summer.
I have observed the trucks on the city streets and the interstate highways.
Unless it is a vocational or construction (cement mixer) all over the road trucks there are single drive with three axle single tire trailers.
I gonna ask one of my friends there to hook me up with someone to talk to. I do see trucks from all over Europe traveling in Spain and all are cab overs too. Very nice and well maintained trucks
All tractors are cab overs, I don't remember seeing a conventional tractor on the highway.
The trailers are rounded in the front and fits over the fifth wheel with at least a 5 ft overhang and is only a foot behind the sleeper cab. It really is a perfect fit with hardly any space between.
I can't see anything I would be opposed to driving one of these rigs. I know for certain the trailers I have seen when empty at least one trailer axle is raised.
So assuming each trailer axle is rated for 17,000=51,000, the tractor single drive is rated for 20,000 and the steer is 12,000...that gives you a GVRW of 83,000 ???
I'm just speculating here, but I intend to check it out
Happy trails to all