This is the easy and inexpensive way for ProPower to power your whole home, via the same NEMA 14-50 outlet that you use the charge the Lightning, via a special male-to-male 8awg power cord. Yes, some will frown on this way to bring the truck's power into your home's main panel, but regardless, it works.
There are some things to consider:
A) alway turn OFF the home's main breaker, FIRST...
B) don't try this if you are not comfortable with working with your own electricity
C) removal of the ground wire in the special power cord is the only way the truck will provide power output in this situation
D) make the LAST connection to the truck's 240v 30amp twist-lock outlet, and ONLY then turn on ProPower
E) Turn the ProPower OFF and do everything in Reverse BEFORE ever turning the home's main panel breaker back on.
To provide lineman protection on the grid, they make a mechanical lockout device for the home's main panel. This simple metal slide will not allow the home panel generator breaker switch to be closed unless the main input breaker is open. This would be highly recommended. As the OP stated, you need to be very comfortable with the safety aspects of your home electrical system.