Cheap tires can be very expensive in the long run. I once experienced a thread separation on the front axle while passing a 18-wheeler. The tire was less than a year old and "on Sale". Since then I do not compromise on tires, ever!
I upgraded the 6 tires on my 34' to 16" and Michelins LT. Cheap piece of mind.
1983 310 Classic Motorhome
1997 30' Excella Trailer