When we refused she blew us into the USPS who insisted that we supply her with a regulation mailbox that was much smaller & according to the USPS we were ONLY required to have the name of the current resident on it.

Kristi - get pre approved to see if your  income as is plus your  husbands and  brothers  will be ample to qualify for what you are needing  ..the fact you have  large  assets will not matter too much ...also self  employed borrowers  will normally  be qualified using the past  2 tax returns and have the self emp income  averaged  .....so the returns for 2019 are not crucial to have completed now .......DSCR loans are  much higher in rate/ fee than normal  home loan prices so best to try to get the  normal loan  before using this type of loan

Does anyone have any advice on these two areas, particularly if they think supply will be stronger in the summer or if the market is just really that tight?

We add to this by considering "point" data nearby that are related to supply, demand, performance, and risk.

We are seeing the average 3 bed 2 bath with minimal rehab running in the 150K-200K range and property taxes are currently low, creating a good opportunity here to prop up the rental market which is slowly running out of supply to the increased demand. 

LTR’s are also in tight supply and demand high.  

Ensuring that GC's are showing up, getting ample work done in a timely manner, and working according to your expected quality is important, but you may run in to red tape with the city and/or utility companies as well.

@Steven Andrews If you want to do a no money out of pocket deal, bring in a partner to supply the money.

Also, I'm not seeing a vacancy rate, utility expenses, admin costs (city license fees, accounting fees, office supplies, etc).

While this demand may be poised to take up the additional new supply, millennial demand may not align with the price point and areas that will see the sharpest rise in the supply of available homes.