I have a 38' Jayco fifth-wheel. I had a lot of problems with tire failures. I went to Goodyear G614RST LT 235/85R16 tires. These tires have a max rating of 110 PSI. This required buying new wheels for...
Assuming you are not exceeding the weight rating of the wheels, you probably just got bad wheels. Maybe they were improperly rated to begin with (it's not an exact science) or maybe you had bad castings (not uncommon).
Yes, there have been reports of cracked wheels, here and elsewhere. It happens.
I agree also that upsizing would be smart. Going 110psi in 16" limits your options and availability of tires and wheels.