I've been a teacher for the past 3 years and I entered the field because I had a poor educational experience and I wanted to impact the world in some small way.

If you aren't offering anything, the buyer will have to pay for it, which will impact potential offers and negotiations.The bigger question should be - how do you plan to advertise?

It's the cost of doing business if you don't want someone else to take your hard earned money.2) Occupancy permanently yanked?

RV are temporary whereas MH are permanent with different couplings and voltage/amperage requirements.Zoning depends on state/county/town laws and ordinances. 

It will not impact the entire market. 

My interest, obviously, is looking at a potential flip that has flooded twice and trying to gauge how to account for the impact of flooding in my analysis.

Ceramic tile or the thick panels, 3 piece are more permanent unless you want a do over in 2-5 years

Everyone I know that has done a side sewer has paid around $10,000 exclusive of impact fees.

Was it because you already charged back the water bill and wanted to soften that impact?

I don't honestly know if it matters tax-wise if it's classified as an RV or a permanent dwelling for purposes of writing off rental income etc.However, before you proceed make sure you carefully look into the local zoning laws, which can be a catch-22 for tiny homes.