@Daniel Pickford that depends on a lot of things.

And depending on the type of auction, say Tax, the owner could have redemption rights so you would not want to make any repairs until the end of the period.Most RV parks have guests and not tenants - if the paperwork was done correctly. 

I was hoping for more 3-400 per door but I guess it all depends.

It will be easier for you to sell the property if needed and you will have multiple options to do so (IE seller financing).This is a slower process than most of the ones discussed on BP, but depending on your long term goals, it could be very effective.

Depending on what your income level is and marital status (single with no kids?)

Track record is a major focus in additional to personal credentials. 4) Depends on the property and project plan.

The reset rate for next 5 year term is 5-yr Treasury + 3% with ceiling of 8-9% (depending on loan).

Michael Ortega-Omega Elite Construction & Renovations-Not the cheapest, but he does quality work, and very dependable.

Be very careful, depending on your state, it’s very hard to get clear title for tax defaulted properties, you usually need wait redemption period expires then suit quiet title for marketable title

It depends on your loan type FHA probably won't let you buy anything that needs rehab.