After having to sell my own horse trailer over the winter, I am looking into having a partial lease arrangement with a neighbor to use her trailer for this summer - I'll be getting a new trailer myself later this fall. She offered me the arrangement - either a per month charge or else a per use fee and I return the trailer to her cleaned out etc. I am just wondering if anyone has had this kind of arrangement before, and what I should be looking into as far as what to have in writing, or if I need to do anything in terms of my insurance? She's got a 3 horse slant Sundowner, it's an older trailer but she keeps it in the barn and it's in good shape. It just sits, she never, ever uses it.