Reflections on 6 Months of RV Research! ;)
Hi Class C Forum, I caught the RV bug about 6 months ago after a particularly stressful stretch at work. Researching RVs has become the way that I decompress when I have some discretionary time. Cu...
Forum Discussion
In the biggest rigs, like 18-wheel road tractors, the rear axles are true tandem and also duallies. Eight tires back there and both axles are powered. The big "tour" buses and many Class A's have a "tag" axle with a single tire on each end. The forward rear axle is dually and powered and the tag relieves some of the weight. I don't know how many Class A's do this, but I've seen the tour buses lift the tag axle to aid in close quarters maneuvering.
I can see how tandem singles on a motorhome would be less subject to that extreme scrubbing in close maneuvers that trailers are. But I think it's because you can force a trailer into a jacknife position with the tow vehicle. Motorhome can't jacknife itself. Tour bus can't literally jacknife itself, but some have such an extreme "cut" in the steering that they'll drag the tag sideways unless they lift it.
I can see how tandem singles on a motorhome would be less subject to that extreme scrubbing in close maneuvers that trailers are. But I think it's because you can force a trailer into a jacknife position with the tow vehicle. Motorhome can't jacknife itself. Tour bus can't literally jacknife itself, but some have such an extreme "cut" in the steering that they'll drag the tag sideways unless they lift it.
