I believe that all hybrids come pre-wired for towing.
I tow with my Hybrid Highlander -- have two trailers, a 12 ft that tows 5,000 lbs.
and a 10 ft that tows 3,500 lbs.
It does much better with the ten foot trailer.
I've towed my kubota 6100 tractor and my Grizzly 600cc ATV and it does this well.

However.... It's problematic on hills -- steep grade hills... especially if they are wet or have a bit of snow.... last winter there was 1/2" of snow and the Highlander crapped out on me and wouldn't go the last 100 ft of the hill. All wheel drive was USELESS and it took 1.25 hours for me to get that last 100 ft.

Quite truthfully if you tow a lot - as I do - you are better off with a real SUV.
The 6 cyl Trailblazer tows sooo much better.... I'm going back to one soon, or the other 6 cyl GM's.
You have to choose... gas milage or real towing capability.