I own a 2000 Impreza wagon, 2.2L 5spd 142hp 149lb-ft

I have been towing my previous Nacra 5.7 on many long trips (300-500milles) without any problems.

The catamaran will induce a lot of drag so the car will not be fuel efficient. I was able to shift in 5th gear on the highway or on really good roads but as soon as it becomes hills I remained in 4th gear. I was doing 200-250 milles per tank

Things to look for:
Tongue weight: I found that a tongue weight of 10% is really more stable with my setup but I usually keep it to 5% to prevent to overload my rear suspension.

Trailer side:
Grease these wheels bearing, A visual inspection will tell you if the are in good shape.
Torque these wheel nuts
Put the recommended air pressure in the tires, under inflated tires will overheat
CARRY A SPARE
Inspect carefully the trailer electrical system.

Finally on long trips, binding straps will stretch and wear out. You have to stop on a regular basis to inspect and tighten everything

Charles Leblanc
Nacra 5.2