The EcoHitch Stealth Trailer Hitch Receiver # 306-X7293 that you referenced weighs exactly 24.5 pounds.
The custom hitch features a towing capacity of 1,000 pounds and a tongue weight limit of 200 pounds. view full answer...
While I don't have that exact figure I can help you figure out the distance from the ground to the top of the hitch opening when the EcoHitch part # 306-X7293 is installed on your 2019 Subaru BRZ. The hitch opening is going to be right underneath the rear bumper fascia so you can measure from the ground to about 1/2 inch below the rear bumper fascia and take the difference between that and the 18 inches you measure for your trailer coupler and you'd know how much rise/drop you'd need from... view full answer...