Hi Frank, I have been thinking about that too for quite a while. I believe it depends on what kit you have and on what base it sits. I have an early kit from FiberFab on a ’71 VW and there is no provision for doing that. FiberFab was talking later on about bringing out kits where the spare could be mounted but in the meantime they are out of business. I asked this question some time ago on a forum but never got a response. I just would like some type of description of the support frame or something of that sort and then I could make one. Oh, well, take care and have fun.