I tow with a 2005 Toyota Corolla that has a 1.8 Liter, 4 cylinder engine with variable valve timing. It does better than the Subaru 2.2 Liter AWD that I used to use and it gets great gas mileage.

I have no trouble going up and down grades, at near Sea Level.

Antything more is a waste, as far as I am concerned.

Note: I don't do much trailering and if I did, I'd want more power. More weight would not be necessary; more power would be a luxury.

GARY
Mystere 6.0
Steel Trailer
Glass sail box
Cat Trax

Santa Monica Bay
Mystere 6.0 "Whisk" <--- R.I.P.