shouldn't be towed 4 wheels down. It needs to be on a dolly/flatbed.
Towing a Subaru behind a motorhome or a tow truck
The following is from Subaru Helpline Update, Feb 99
updated November 2009 re automatic
There has been a change to the policy regarding towing of Subaru vehicles behind motorhomes. The following applies to 1990 through present model year Legacy (Including Outback), 1993 through present year Impreza (incl. Outback Sport), and 1992 through present year SVX. (Note: should also include 1998 through present year Forester. Joe)
The factory hitch is 1.25" a 2" hitch can be installed aftermarket
All Wheel Drive vehicles can be towed with all four wheels on the ground or with all four wheels off the ground on a trailer but towing an AWD vehicle must never be attempted with only two wheels on the ground or two wheels on a dolly.
STI, to tow: DCCD must be in manual mode, with the DCCD control dial set to the furthest rearward position (rolled toward rear seat).
Front Wheel Drive vehicles can be towed with all four wheels on the ground in neutral or with the two front wheels off the ground.
November 2009. Automatic transmission and CVT vehicles can be towed with all wheels on the ground in an emergency for very short distance (under 31 miles) and at very slow speed (under 20mph).
AWD automatic 4 and 5 speed vehicles should not be towed with any wheels on the ground. The vehicle can only be towed on a trailer with all 4 wheels off the ground and the transmission in park.
Note: always inspect and check your car: radiator, coolant, all hoses, all fluids, brakes, towing equipment, lights etc