Power to weight ratio across all 3 generations

Always wondering about this but it seems with most car manufacturers, each generation gets slightly more power output (the case of the gen 3 having 1 less torque makes this debatable, I know). However, each generation gets heavier so the net gains for overall power seem like they could be less than the dyno says.
I towed my 2500 lbs pop-up trailer with my gen 1 but am wondering if a more powerful gen 3 will even pull it better since there is a ~700 lb curbweight spread between the two.
Has anyone towed with a gen 1 and a gen 3? Will towing still be better on a gen 3 even though weight is up?

 

thanks