We have a 2017 Cyclone 3611JS and the exact same thing just happened to us on our trip home to Florida from spending the summer out west in South Dakota workamping.
When we left SD the tires were in excellent condition. When we left Elkhart, Indiana we noticed the wear on the outside only of all 4 tires. We made it to our home base in Florida but now we have to deal with "fixing" the issue as we live full time in our RV.
One step at a time, need to find out the cause first, then weigh the financial options that are available.
A bit surprised that this wear happened rather quickly, at least that is my opinion as we traveled all of 2016 on the east coast with no problems. Then we drove all the way from Florida to South Dakota in April 2017 with no problems.
It's always something whether you have a sticks n'bricks or a home on wheels!
Susan