I think also overtime the DIY process would get faster from the experience being gained.

I get around 8-12% APY on all of my capital and I can convert it back to USD at any time.I don't put my capital into savings or checking accounts because you're losing money value faster than inflation and .05% APY is not worth it for me.

just like a bank.they will run fico but not as weighted as a bank.

No bedrock, no cement, not even a stack of stones, nothing to keep those 4X4s from slipping in deeper and deeper, which is what they do with the weight of a kitchen and the help of a few million termites...and being the old deck/back patio...as in 1920 house. 

Tenant moves out and causes $1,500 in damages but you only had a $1,000 deposit, so that's another $500 in lost income.You could do better through scale because most units get rented faster than a month, most homes don't need a new fridge, and most renters don't leave owing more than their deposit.

its a people business  its heavily weighted on your ability to be a host and enjoy what your doing. 

In the process to make financial decisions my parents tend to weight heavily on what they thing I should do which also carry poor financial decisions.

* Does the frequent on/off of fan wear it out faster?

If negotiations commence around the additional value of the land, you can consider asking the seller to carry at favorable terms, or some kind of delayed payment plan for the additional land so the park is not burdened with that extra weight right out of the gate. 

Brandon Turner's book on Managing Rental Properties is worth its weight in gold in my opinion (not even kidding).