Different areas offer varying qualities, but most hold investment potential.

I understand you tried that and it was rejected but I think you just need to keep putting offers out there. 

This region is well-suited for MHPs and offers unrestricted land.

And if they did, I'll offer them 1% and be done with it.

I was looking into a virtual number such as from RingCentral so that I wouldn't have to use my personal cell in any guest communications, but I also noted that many of the PMS such as OwnerRez and Lodgify offer SMS messaging.

I was recently offered mentorship through a veteran's program for commercial real estate.

You could consider offering to have the shower inspected by a licensed professional to provide a written report confirming its safety and functionality to address your tenant's concerns.If your tenant continues to refuse to pay rent, you may have grounds to evict them for non-payment of rent.

Both have their own unique advantages and can offer great potential for real estate investing.

Does anyone have any experience with Offer Market for DSCR loans? 

Selling can unlock equity for a larger building, offering diversification and potential higher returns, especially in the current strong market.