What are the most common challenges investors face in these neighborhoods, and how can they be mitigated?

Most homes are 15-20 minutes from the headquarters of the world’s largest retailer and have mountain bike trails in the common areas. 

That might take some doing if it is a 32" door which is pretty common for basement entrances.

This is basically you paying into a bond that will pay damage and lost rents if you are unable to the landlord but this isn't a collective of money pooled together for the common good. 

According to people who study the stock market, there is a common theme, "buy the rumor, sell the news."

This is really a common problem happening all over..

Granted MFH are more common in rougher parts of central jersey and my purchasing power can't acquire me something in North Jersey here homes are much more desirable when it comes to appreciation and schools and safety.

The concept sounds like "Equity-like returns without equity-like risk.”Preferred equity investments, which sit between senior debt and common equity in the capital stack, also see increased interest.

The most commonly used marketing channels in wholesaling are SMS, cold calling, PPC, radio, TV, and direct mail.The channels that I'm using currently are SMS and cold calling.

Quote from @Chris Seveney: @Adrian SmudeI would agree the days of buying and getting 100% of your money out so you have infinite returns is not coming back anytime soon but the method still is common you just have more money in the deal if you want it to cash flow.I do agree BRRR is easy to do with super low rates and increased rents for someone who could value add a property.