We find it rather odd that so few manufacturers address this problem bearing in mind that most motorhomers are all over fifty. The problem with dual wheels is that the inner wheel's valve usually faces towards the inside making it almost impossible to hook onto without laying on the ground! Well Swagman are setting the pace and the photos below came from one of their larger models. You can actually buy brass and stainless steel extenders in the States for around US$14.00 a set. When we find the email again we will pop it up on this page. In the meantime try this link - no prices yet!