It's great to know and plan out all your options well in advance.
During this Pandemic big rental companies have sold off many of there (fleet) vehicles which has created a shortage of reasonably priced rental vehicles.
Airbnb are being selective about who they rent to and some are asking for proof of vaccination and a recent Covid testing.
I would personally have enough bank rolled for a motel/hotel stay.
Many employers (mine included) are warning if you travel and have to quarantine you could lose your job.
My understanding is if I show positive for Covid 19 while in the USA ,,,, as a Canadian I can return to Canada via a vehicle but will have to
show the ability to quarantine to the Canadian government. (Quarantine plan of care).
I am not sure I would be able to re coop my return flight cost ,,but that is just me. Maybe others have a back up plan for this.
This is a good reference for those traveling right now.
https://travel.gc.ca/travel-covid
Let you family doc know you plan on traveling and ask their advice.
Know the Covid 19 numbers where you are going ,,,rates of vaccination in the area and current positivity rates.
Know what mandatory precautions the community is enforcing and not enforcing ,,,, are you ok with that?
Know that the medical system in the USA is very different than in Canada.
Each individual dept. bills for things. (X-rays. .labs.. medication.. etc)
Even an ambulance ride can cost a lot.
Usually up front payment is required.
So much to consider when traveling now.
Good luck to all those planning for a safe successful trip.
Hugs
Mel