I have had my enclosed trailer for over 20 years and never had a problem until I burnt up a wheel bearing last year on the way to Cecil County for an index race. Luckily it happened less than 10 miles from my house and and only 2 miles from my sister in laws house and I was able to limp there. I ended up having to replace the whole axle as well as the brakes and bearings on all four wheels. It is my own fault as I should have done better maintenance on the the bearings. I don't worry to much about towing as a fellow racer / friend owns a towing company I could always call. My trailer being 24 years old now is being replaced by a new one next year.