My biggest concern is they will pawn you off to a junior (or not even licensed 'consultant' - or whatever they call them). 

Her biggest complaint was that the rent was too high. 

Hi Scott, The biggest distinguisher I've seen is that they must accompany the person at all times.

My biggest struggle right now is the rehab process but learning everyday to become a master at it! 

I actually don't like the idea of paying off a property either though, I think one of the biggest reasons for investing in real estate instead of the stock market is that real estate is setup to use debt as leverage.

Vetting the tenant seems to be the biggest predictor of success.  

The biggest financial messes that I have seen are from those that do something because they heard someone else say that it was a good idea all the while never actually understanding what they are doing or developing any subject matter expertise.

I have started analyze the deal and am still working on the details. monthly costs are roughly $1300Potential income is between 8k-9k dependingcurrently only 1 lot active at 950/mnth9 others with mobile homes in need of repair - cost of rehab of all units could be up to 100klot rent would go from 300-400 per without homes in this area seems like a pretty high upside and not very low downside to the deal.

The biggest obstacle here is not City zoning or ordinances (many have even addressed it yet) but the local Home Owners Associations who have put minimum restrictions on home sizes.  1000 sqft is one of the smallest, 1200 sqft is the average I've seen in my area.  

Your biggest obstacle is that you are young and have no experience.