I think that you would need to look into it carefully, I think that there will be regular site fees and also, I believe that it can be expensive to keep them adequately heated and damp free - Most peoples experience of using mobile homes is from using them during the summer, I would imagine that winter might be a very different prospect. Is there any way that you could do a short term let to see how you get on? I would guess that it would depend on where you live, or are choosng to retire to.