Are you going thru Your brokerage to conduct the transaction or by way of being an investor are you simply going to the seller, putting the property under contract and closing or double losing with an end buyer and not involving your brokerage?

Also, check minimum lot size and street frontage as you may need to carve the mobile home park out of the existing lot versus pile onto the existing lot, so if you are trying to preserve the existing structure, you may lose some lots considering setback requirements and access.Your local government may require public water and sewer for a new mobile home park, so be sure to check the requirements and distance to the nearest connections.

Do what you can immediately and start the process to avoid losing more money.

If you own a house and they move out you lose 100% of your income if you own a four plex you only lose 25%. 

I talked to the lender that I'm doing refi now and they said I can only choose one: the line of credit or the refi.I don't really want to lose that 2.6% but still want to do the refi as the rate is low as well. 

I wanna protect myself from liability because all properties will be bough cash so I don’t want to lose any of them.But my question is what LLC structure should I use?

So what if we lose thousands in damages and lost rental income?

In other words, more people will be motivated by the prospect of losing a dollar they already have than will be to gain a dollar they don't yet have but have equal odds of achieving.

At least short term capital gains are taxed at your marginal rate so you aren't "losing" anything there. 

One problem I do know of that is becoming a cancer is people not wanting to go back to work due to them receiving unemployment; and with the schools shut down, kids are home all day and need a care taker, so most parents are choosing to not accept new work, which is illegal actually, and if reported they could lose their unemployment.