Toy haulers mean 3/4ton+ trucks, especially those ones. The frames are heavier than comparable RV becasue they have to hold 3000+ pounds of toys at times, so they weigh more than comparable sized RV. Then, you actually put those toys in, boom, over every rating the OEM gives for 1/2 ton trucks. Besdies, you'll want the power from a V10 or diesel for something that large and heavy.
Going to a 3/4 ton truck will mean more gas and rougher ride than 1/2 ton for all the non-towing driving. There may be some smaller options for you.
Travelstar has some options as well as Rockwood Roo. These are hybrid trailers with expandable bunk ends for the beds and exterior storage of the toys.
What kind of toys do you plan to tow?