The number one limit to towing is SAFETY. Generally speaking, any trailer weight that when combined with the actual vehicle weight does not exceed the overall maximum gross vehicle weight should be ok without trailer brakes.
The 2012-2014 Toyota RAV4 EV has a maximum gross weight limit of 5005 pounds. The “curb weight” (unloaded weight) is 4032 pounds, therefore you have 973 pounds available for “payload”, plus driver, passengers, baggage, and fuel, plus the trailer towing hardware of approximately 50 pounds.
Assuming a single driver weighs 200 pounds, and nothing else was in the car (no passengers, no bags, no fuel), then you could safely tow a 723 pound gross weight trailer without trailer brakes. Don’t forget to include the 50 pounds of hardware required to tow the trailer.
4032 - Empty weight
50 ——Trailer hitch receiver and ball hitch, plus vehicle wiring for trailer
200 - Driver weight
0 —— Passenger weight
0 —— Baggage or cargo weight
0 —— Fuel weight
723 - Trailer weight (with its payload)
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5005 - Maximum gross vehicle weight limit
Above that weight, we recommend that trailer brakes be operational and used. Obviously, we can’t recommend a maximum tow weight, but certainly it is probably safe to use the weight limits that Toyota uses with similar RAV4 vehicles with equal or greater braking capabilities.
Another consideration is engine cooling for towing, and the 2012-2014 RAV4 EV has no difficulty nor issues in this area.