Glad you were OK. My MH came with those same Goodyear tires/size and I WAS NOT impressed with them and will not buy GY. I was very surprised once when a front tire blew out as handling was very easy and smooth. But I didn't have the cruise on.
Ours did not come with a spare but after being stranded on a Sunday morning and only one local guy having a replacement tire and asking $979.00 for it. We got a spare to carry. That Sunday I ended up taking our toad, driving 1.5 hours north to get a replacement tire for $160, then driving back south 1.5 hours to get back to the MH.
The things we go through to relax and have fun.. :)