We are retired, financially blessed, mid 50's and wanting to purchase a motorhome for our journey. We have a real estate corp. (S type) in the US. We have looked through the internet and not found any direct methods. D type National Visa would be perfect but we don't know how to pretest our application before sending it in. Would extended visa in Italy (for example) allow us to travel more in the other Schengen States or just stay in Italy until our next 90 days of 180 open up? Any thoughts would be appreciated.
France certainly have a visa called as long sejour (tourist). But from fresh experience (and I was being advised by a top-notch lawyer-emigration agent), I would suggest to not rely on it- its rarely given, and Embassy can find trivial reasons to refuse it. Not worth of time, and hassle.
Spain has got similar visa, and if you can really afford it, investing there could get you this visa with ease. You might have to check the duration of your stay against the investment though.