Ron, thanks to you and Linda for the helpful reply!
Will order the ball and find some noodles soon.
Will be draining and winterizing today

Last year I kind of rushed through the covering process and although no damage to the RV or cover seems to have occurred, these gold line covers cost enough that I think more care is in order.
I like the pool noodle idea for corners and covering sharp edges and will do more of that this year.