More often than not, you get what you pay for in tires.
I also prefer to go with a trusted name brand offered through a trusted store. I have ordered through tire rack before, but then again, I purchased name brand tires too.
I might order off-brand tires if I was placing my camper in a permanent spot. However, my TM travels over 1000 miles per year and not worrying about the tires work well for me.