Sorry for the late reply... I have been in the Mountains enjoying my new tires for the last 11 days.
My new width is 52". The distance between my wheel wells are pretty close to yours. I put a couple extra lbs in the back tires to assist (I back in). I have to be centered well but it works. Definitely see some "rub" but no damage.
Yup... A good guess after reading a lot on here and learning. I see you are in Woodinville. I have family there... What a great place. I love the Tipsy Cow!