We have a Subaru Legacy Wagon with a 2.2 liter engine rated at 142 hp @5600 RPM and 140 ft/lbs of torque @3600 RPM. After we cram it full of vacation "stuff", we use it to tow an H16 on an aluminum trailer, that we mounted a large car-top cargo container on (with more "stuff"), from Frederick Maryland to the southernmost North Carolina beaches with no problems. This car has also towed this arrangement over the Appalachian Mountains to a lake in Western Maryland. As did many other vehicles, the Legacy did struggle to get up certain steep roads, dropping from 65 MPH+ to 45-50 MPH.