I have a Surco roof rack with gutter mounts. I had my 33x12.50 spare up there for a while but had to take it off due to the fact that the mounts kept breaking with the weight of the spare and the bad roads here in VA. Surco sells a different set of mounts that go directly on the factory rails but they don't look that much sturdier. Just wondering if anybody has had the same experience with this rack. Any suggestions?