The front of the garage has 2 car side by side parking (for compact cars), and the back of the garage is inaccessible for a car.

Compact it, then relevel the whole area 3-4 inches higher with topsoil?

Then stress your returns assuming this higher rate, and verify that you're still cash flow positive in that worst-case scenario.If we get very high rates and inflation, and it happens in a compact period of time, bank earnings/capital is going to come under a lot of pressure due to the way they structure their portfolios.

Just have the road graded first , put a crown on the road and use a vibratory roller to compact when done 

That is like a car dealer saying I have discounted cars available, but before you get to see them, I must see your cash.Too often these portfolio of cars will be the ones that have already been compacted.

IE installing septic systems in many different scenarios and building a compact treatment plant for a subdivision we developed in Rural Nevada county CA. 

Dallas and Oklahoma City both have very strong and healthy economies but the price/rent ratios are not as good and Dallas has high operating costs (taxes and insurance) which will compact your ROI.

The kits include compact fluorescent light bulbs of various wattages, LED night lights, smart power strip, whistle that attaches to your HVAC air filter and alerts you when it's time to change the filter, low flow shower heads, dryer vent cleaning brush, water temperature thermometer, refrigerator thermometer, weatherstripping, caulking, foam pipe insulators, window film, rain gauges, etc.

We used metal edging, "black star" gravel in the beds up front and seating area, planted sod (900SF by seating area), compacted pea-gravel on top of road base for the driveways, and did a planter at the corner of the property by the street.

You have all paused me to think about a response, so I will try and compact it into 1 post.