Here's what I'd do (and sort of did, but had a slightly different path to get there ...)
Just get a quote from an electrician to add a 50a circuit and a receptacle, either an N14-50 or an N6-50. As someone pointed out, those are NEMA specifications for a heavy duty 50a outlet, which will (should) have the appropriate grade wiring to the 50a circuit breaker in your box.
Some quick background on the two:
- N14-50 is a 50a spec, uses 4 wires, it has an extra neutral, the connector is 4 prong. It's popular in RV parks, because it's 2-phase, it can supply both 240 and 120 (which is a common need in an RV).
- N6-50 is a 50a spec, uses 3 wires, only supplies 240v, the connector is 3 prong. It's common for use with high power equipment like welders.
The N14-50 is sometimes more costly due to needing an extra neutral, and for charging an EV, it doesn't buy you anything (outside of having a box you could use at an RV park), so you might ask about an N6-50 instead.
These are the various physical plug configurations, just as an FYI:
People are sometimes surprised by the size of the 50a plugs - left number plug config, right number, max amps.
Don't even talk about your use case with the contractor, just get a quote on the outlet being installed: breaker, wiring, receptacle/mounting box. If the install is within 1-2 feet of your box, and there's nothing weird about the existing install/construction, it shouldn't cost a ton. This assumes your existing box has space for a 50a breaker and your existing power is reasonably up to date.
Then buy whatever EVSE you want, a couple of lug bolts in a stud, hang it up, plug it in and you're done!
Since you have what sounds like an inclination to possibly add another EV to your vehicles, this provides an outstanding plan to get a J1772 spec charger, that will work directly with a RAV4 and with the Tesla included adapter, work perfectly well with the Model 3.
That's exactly what we do, share a 40a Grizzl-E Smart charger between our TM3 and a Wrangler 4xe. The vehicle negotiates the charge level, so there's nothing to do other than plug in, the Tesla gets 40a (~36 miles/hour), and the Jeep gets 32a. For long duration, constant consumption (like charging an EV), you should not pull more than 80% of the rated amps of the circuit, i.e., a 50a circuit - 20% = 40a.
The Adapter is just a small, round piece that sticks onto the end of the car side of the connector (mine is either on the charger, or in a little utility type hook/holder right above the charger).
The thing I like about not hardwiring the charger, is I can easily unplug it (and even transport it if needed), but it allows be to swap chargers if - for example - the Grizzl-E was to fail, I'd just fall back to the included TMC and I picked up a 6-50 adapter for it (the Jeep is a PHEV, so it wouldn't be as much of an issue).
In fact, you COULD just do that very same thing in the shorter term. Tesla sells additional plug (in the photo above), that allow the included-with-the-car Mobile Connector to plug into a 50a circuit, either a 14-50 or a 6-50, though it's limited to 32a.
We got a really nice install on the N6-50, for right around $220 (northeast Florida), and I scored that charger before the price hike so it was $440, and it's a beast (designed in Canada, for their weather), 24' charging cord that's the size of a fire hose, all metal, big stainless bracket (with a quick release) and as I mentioned it's an N6-50 plug, but it's also available as an N14-50 like many chargers.