You have lots of options with a 19' trailer, almost any mid size SUF with a tow option, or any pickup truck will tow that size trailer.
We love our Ford Flex, it looks great and would make a good tow vehicle for a 19' and a great daily driver. Mine has the EcoBoost so we get good non-towing fuel mileage (11L/100Km city), much better mileage than the Toyota Tundra, however we like having the Pickup Bed and Tonneau when we're camping and I can't put a canoe on my Flex because of the sunroofs.
Good luck with your purchase!
1977 Safari Land Yacht
2005 Toyota Tundra SR5
2010 Ford Flex Ecoboost