look at it as "houseless" not "homeless". you can make a home anywhere.
for your clothes you can def do the storage unit thing or you can have a net to put on the ceiling of your car and put your clothes in that. definitely use gyms, truck stops, and maybe even your place of work for a shower if a shower is provided.
Get tinted windows and even window coverings and I highly suggest these for ventilation at night.
I suggest a goal zero power station with solar.
Get an extra foam padding for comfort when sleeping. GET A FAN!!! Highly suggest getting a fan!
ioverlander, freecampsites.net and google maps to look for free parking. I know Cracker Barrels are really nice and legit!