I wonder if he didn't mean in an emergency situation?At least it wouldn't roll over,if you had a blow-out,with two additional axles supporting it.Or you could at least get off the road and parked unlike a single drive axle,with no tag.
I'm almost afraid to post anymore.The one area I thought I knew something(Trucks) I find out,I'm ignorant their too!!
I never realized they had tridems(3 powered drives)but after my earlier post I see Nac had a link to a Kenworth site that proved they did,in a different thread.They must be rare though,I've always seen lift axles,when the capacity needed to be greater than a tandem.LT9000 said they used them in BC also,for logging.
I had assumed the "super singles" used on the drives could fit a steer axle,but I'm probly wrong again,as per usual.They could have interference problems with the steering components due to turning,I supose??
Nac,I can tell you with confidence,that I'm SURE that they're(Tires) all black,round when new,and will leave skid marks in the dirt when you fail to check if your brakes are frozen,like mine this morning!