Unfortunately, no such vehicle exists that is a light nimble fuel efficient family runabout, AND a beefy powerful heavy trailer towing machine. These two things are polar opposites of each other.
So many times people come on here and post how they don't want to drive a big heavy truck all the time, but they've got their hearts set on this massive trailer and they absolutely *HAVE* to tow it with something that isn't much more than a glorified compact car. It just doesn't work that way. Physics is a cruel mistress.
Compromise is the name of the game. You need to be willing to live with the big beefy tow vehicle for your daily driving, or you need to find something that is more in line with the capabilities of your chosen vehicle.