I went ahead and ordered this kit before I realized it was something new from Tesla, NEMA Adaptor Kit! I thought why run the risk of not having the right adapter when travelling. Each item typically costs $35 with no option or discount for ordering more than one. Now you can save a little money $220 vs. $245 by ordering their new bundle that includes 7 different NEMA adapters.
https://shop.tesla.com/product/gen-2-mobile-connector-bundle
Here are all the maximum outputs and estimated charging speeds for each adapter with different models:

Note: Estimated miles of range per hour of charge for Model 3 with NEMA 5-20 is incorrect on Tesla’s website as 4 when it is actually 7.
Use the Gen 2 Mobile Connector Bundle that comes with your Tesla Model 3 / S / X and switch out the NEMA 5-15 adapter for all your power needs.
I’m researching the idea of exploring Canada with one of these adapters before Tesla expands the Supercharger network across the country, focusing on RV parks and non-Tesla EV stations.
UPDATE: I actually drove the Model 3 through Canada and with so many charging options, I didn’t need any of these adapters except for the one that came with the car to charge at two different Airbnb rentals! Read and / or watch the first day here:
Tesla Road Trip: Traveling from Madison WI to Comber ON
If you could use my referral link to buy a Tesla Model 3, S or X. I will use my extra Supercharging miles to photograph our beautiful country. See below:
⚡⚡⚡Use my referral link to receive 1,000 free Supercharger miles (1609.34 km) with the purchase and delivery of a new Tesla car, or earn a $100 award after system is activated by purchasing or subscribing to solar panels: Model S, Model 3, Model X [tesla.com] or Solar Panel [tesla.com].