ike another post said.
Jacking a Towable, the heavier and longer the worse, into parking spots and just going around curve and over curbs etc puts tremendous side loads on belts etc of tires and causes a lot of tire failures. Chinese tires generally are not up t o snuff; just that simple. Axle assemblies, from the factory don't have high enough load rating for a loaded RV and tanks. The axles and thus bearings, brakes etc are selected by lowest bidder. To make the maximum profit you use the cheapest stuff you can find, these days.