Originally Posted by dieselguy
"This tells me what I had already had guessed - a dual axle installation is much harder on tires than a single axle."
I don't think "harder" is speculating correctly here. Although I pull in the 12.5K plus category ... I've never worn out any tandem axle tires in over 20 years of RVing. I seldom go over 5 years on tires. Not because of wear, but because of carcas lifespan.
Are there plenty of tandem axle RVs that don't have tire failures? Sure. But there are still a disturbing number of catastrophic tire failures being reported on various forums. And I stand by my conclusion that the squirming and side-ways rolling of the tire that is more prevalent in tandem (dual) axle configurations is a common failure mode for trailer tires. Otherwise, the manufacturer wouldn't derate his tires by 11% for a dual axle installation.
The obvious other conclusion is that running tires at less than 90% of load capacity is a good thing, apparently significantly decreasing risk of failure.
2014 Rockwood A122
2008 Hyundai Entourage (minivan)
camping Colorado and adjacent states one weekend at a time