The other day I bought a new wheel clamp- a Nemesis made by full stop. The instructions were that it fits any wheel between a 10 and 20 inches....Rubbish! What the guide forgets to mention is that if you have a higher profile tyre (70 in my case as i'm sure is with most motorhomes) it does not fit. oh: The trouble is you can be fooled into thinking it is well fitted but I managed to remove it in 5 seconds without the aid of any tools or excessive force. Glad to say i got a full refund and have chosen a more suitable clamp from another supplier. I know a lot of you will be thinking 'no clamp is fool proof' and I am the first to accept that, but 5 seconds! If anybody has one and wants to know how to put it through it paces I will gladly answer through a PM.