I'd like to back up my dog back in the trunk and through this adapter for car seat belts. I thought I try it times out how much freedom he has when I mount this on the back seat and then back lay in the trunk (between the folding part by) and I must say it :-) adjusts in length to have my dog enough room. I have a 4-golf and am really excited. On a small piece of paper which was going on it was that the Adapter is not intended for Volvo !! Me and my dog are happy, just like with the price-performance ratio.