Make sure to get legal advice on what you can and can’t do for bill back and what kind of notice period is required in your state. 

I am wondering if transferring the cash periodically to a standard brokerage IRA account may be my best option.

Keep in mind that they can increase that period if they get complains from the community, so make sure you're in good relationship with your neighbors.

In some places there are a few days grace period to allow for rent that is sent via mail (which I don't get because if it is due on the 1st, plan ahead). 

No...there are many reasons why installing it over the carpet will prove to be a nightmare in a relatively short period. 

During period of low interest every post on BP was about cash flow - now that cash flow upon acquisition is dead the only option is equity which is also reeling because price appreciation is finally back to realitypersonally I buy for growth because I buy to hold for 10-20 years or longer.

To throw a wrench into things, if we were talking about real property/structures that were being short term rented, it's possible/likely that your depreciation period would be 39 years, not 27.5.However, a vehicle - which is what an RV is, regardless of how you're using it - is 5 year property.

When it comes to these types of auctions by the sheriff, is there a waiting period that must be observed before rehabbing/renting the building post winning the bid?

This isn't 2011-2013 days but many people are stuck in that time period STILL.As I finish my licensing study, I'm very grateful I chose this route as opposed to being a one trick pony.Wholesalers did themselves in by their method of operating.  

@Jordan Kaylor @Jeanette Land    Seasoning requirement is a industry term for waiting period.