RV trailer manufacturers install the minimum springs, tires, and wheels they can get by with. The result is often broken springs and blown out tires. I had both.
My manufacturer, Keystone, agreed to replace the springs with heavier-duty springs, but they would not upgrade the tires because the tires were rated for enough weight capacity for the max axle weight. So Keystone installed heavier duty (= more weight capacity) springs, and that was the end of the springs problems.
My trailer came with Goodyear Marathon ST205/75R15C tires on 5.5" wide wheels. Nice fancy chrome wheels. Two blowouts on the first long trip. Neither Keystone nor Goodyear would do anything about the tires, so I replaced all the tires with Cooper ST225/75R15D trailer tires, and the rims with 6" wide rims required for that size tire. And that was the end of my trailer tire problems for the next 8 years and about 80,000 miles. (Yep, we put lots of miles on that trailer between 2001 and 2009.)
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.