Worse yet, what happens if credit markets are frozen and you can't get another mortgage at all?

If your someplace that has harsh winters, frozen pipes can be a nightmare for mobile homes so I would suggest checking the insulation underneath etc...I think the main difference is that mobile homes tend not to be as durable as a normal sf stick built home so your ongoing maintenance and repairs are usually higher.

The downsides on the line of credit are the risk of the line being frozen by the bank or reduced entirely so when you really need the money it might not be available.

To make matters worse, in a lot of areas tenants are not leaving like they normally would as all evictions have been frozen.

The garage, and a room in the basement, was piled to the rafters with leftover building supplies, busted power tools, used tires, all kinds of stuff, frozen in the PA winters, broiling in the PA summers, always rusting from the humidity and damp.

Where the Bible says "Many are called, but few are chosen" (Matthew 22:14), Mainers say "many are cold but few are frozen". 

There is a possibility the current HELOC's could be called or frozen.

The space heaters also ended up protecting our property from frozen pipes.

HML might have been an option on the right opportunity a few months ago, but those loans are pretty much frozen right now, unless you have experience and an existing relationship with the lender.

Sam Zell just gave an interview on Bloomberg about the oil & gas sector, but it's comparable to REI in this regard of a frozen market.