You don't mention how old this place is, you don't mention where this place is, but I think it's pretty safe to assume your place was once a big old single-family residence that was Mickey-Moused into a Section 8 duplex maybe fifty-sixty years ago and sits squarely in what is now a D-class neighborhood.Sell it.

We would put in a shared septic system, gravel roads, gravel pad, stub out water and electrical connections.  

Does anyone have a rental agreement for pad split or room rental?

Land development is a huge challenge in the region, but there are some communities (Walnut Cove, for example) where you can buy lots that already have roughed-in road and pad.

We also replaced all the carpet and pad in the bedrooms, and thoroughly cleaned the ceramic floors. 

I would likely put in a 2.5 car garage.We have had one estimate for just replacing the drive and 2.5 car pad (not including garage) and that came to $25,000. 

Surface- Rock or hard surface (concrete/asphalt);If on rock/asphalt put your tongue leg or stabilizer pads on widerpads to spread the weight out.

I discounted my offer substantially based on the major problems described - no documentation or invoices for any work done (so I can't take from previous tenant security deposit now, a primary requirement in the first place) some very vague descriptions of work done, certainly some padding somewhere.

Purchase price: $500,000 100% seller financed 25-Pad RV Park, only 5 miles from the beach!

If you're not dealing directly with a lender then they'll be padding what your actual rate could be.