About Avi, he hasn’t had any issues. There’s no hitches made for the STi, but I believe the WRX one fits, you just lose the rear aero panel (oh no!). We googled it and came up with hitches that worked, installed it and he had no problems. He has a Hobie Cat on a trailer, its maybe 1000-1500 lbs (trailer is heavy) and he towed it to the marina by the lake and tows it from the marina to the lake when he wants to use it. The trailer itself doesn’t have brakes and he has had no problems driving or stopping with it.
He also towed his dad’s Jetski, like newman does, but a jetski isn’t that heavy.