Anyone got a tow-bar mounted bike rack on their Octavia? I want to get one - and will be having the factory-fit towbar on my new car - but just looked at the manual which says that the maximum length for a vertical load is 70cm; the racks I'm looking at are more like 1m for 4 bikes. Overall weight won't be a problem as two of the bikes are kids. Any thoughts on this? Cheers.