My wife and I bought Gazelle Ultimate T10+'s and are expecting delivery in a week or so. I have a bike rack that is plenty large enough for the two bikes. The problem/concern is for her mid step version. I need a cross bar adapter (or tube top frame adapter) that will support the 58 lbs. The closest that I have found is a Thule cross bar adapter that is rated to 50 lbs. Are there any that are specifically rated for e-bikes?