Have you checked to ensure it's legal to live in an RV on the property as the primary residence. Many jurisdictions don't allow it and all it takes is one complaint.
Few years back, a property owner down the road from us (rural area) put an RV on his lot and buried a large holding tank in the ground for it. Wasn't long afterwards that he knocked on our door asking us to sign a petition against the township so that he could keep the RV there. The RV and holding tank were gone shortly after that. Mobile homes are allowed no problem but must have approved septic systems.