What happens to my rental properties if the dollar collapses and I still own money on my mortgage?

So I hired a contractor to come clean the 40' long 10" diamater tree branch off the roof and numerous other branches leaning collapsed fences, I hired another contractor to come fix the roof leak. 

I try purchasing only things that are either multi-purpose or can be folded or collapsed. 2.

It's unlikely that we'd see a similar sort of collapse. 

Or you find out that your PM found his wife under the keyboard player of an 80s cover band last week and is locked up for ag-assault in the county jail for thirty days with no one available to collect rent or continue the process of evicting those people on Center St. who might or might not be running a under-the-table daycare center/illegal pain pill distribution center out of your property...Does your whole house of debt collapse because Murphy wasn't in a good mood this week?

My now wife (then girlfriend of only one year) jumped right in with me and we closed off a back area that collapsed, removed that from the structure, closed off the upstairs, and made the lower livable.

We just had a sewer line replaced because it collapsed.

If enough water comes through, it could rot out the boards and the whole thing collapse.

Cutting corners in turn-key rehab is nothing new but in midwest, this could result in the roof collapse in the middle of winter. 

After purchase, The roof leaks, I contacted the village to get the information of the contractor and  they informed me the roof did not pass inspection and the roof ridge lines are collapsing and certain areas of the roof need new decking and the shingles were not installed with underlayment.