I personally use the mass text capabilities through my Resident RE CRM.However I have a few friends who wholesale and invest and use Mobile Monkey to mass text and from what they say the price is pretty reasonable.

go to local meetups, they should have some here or try meetup app or eventbrite. continue to network and that can help you execute your plans.

I am seeking recommendations for an app that can integrate with multiple platforms.

IE rent to a tenant for >12 mo,  dating before marriage, no late payments then with a down paymetn (long story here)  I'll sell on either a contract for deed (typically mobile homes on land) or a note and mortgage (regular nicer houses). 

Proper underwriting - this includes an appraisal, loan app and full underwriting to comply with CFPB regulations.2.

I will not comment as to the tax laws and underlying rules - that is a discussion you can have with your tax advisor who presumably you are paying to help you.What I will do is provide practical and business guidance on tracking time.Firstly, there are apps available that can assist with time tracking where you can specifically detail your time, who you met with, etc.

You can use third-party apps like SmrtPhone or CallRail for the dialer and texting functionalities.Salesforce: Known for its versatility and extensive customization options, Salesforce can be a powerful tool for your business.

Mobile home parks?

Go to AirBNB app and research which areas have the most listings, that usually means that its a HOT area and if you run it right you can succeed.  

Have you looked in to being a mobile notary?