Thanks for your reply. I bought mine as a minibus and they were already partly lowered. I cut away the the complete wheel arch area. which was large due to the twin wheels, and then re-welded a frame back in place. I paneled it in with sheet steel and have now insulated and boxed over the top. They only rise up about 70mm above the floor and I have a 70ltr water tank on top of one side and the other is a walkway to the side of the bed. I will try and post some pictures. I went to France last year fully loaded and the wheels never got anywhere near the arches probably as I have taken off the tail lift like yourself. I only had a bed last year but now am working on the rest of the build.