Just went through that. 2 blowouts within 5 miles from each other. 2 year old tires with less than 5k miles on them. Always check PSI, always look for cracking. Didn't matter, they just exploded. Never seen anything like it. Tires were made in China and the reviews were horrible and even mention of a class action suit. I went with 4 new G rated tires all around. Funny, insurance guy came out today to look at the damage and said if they were US tires they may have some recourse to get some coverage on the tires themselves and maybe get the company to pay for some damage but the one's made in China they can't do anything about. It's a known problem.
I read the warnings about the tires that came on my FW and decided to save my money and run them for a few years. I gambled and lost. Good news, we didn't have much damage and a low deductible. But it could have easily been much worse.
I feel for ya. Frustrating to spend good money on an RV and the tires are literally ticking time bombs.