He he, the op gives the specs of his trailer and they are within the capabilities of the 1/2 ton. Immediately someone recommends a 3/4 ton and before the first page is full folks have recommended 1 ton. I just love how know it all none engineers know better then the folks who designed the trucks.
Since "bigger is always better" and I've done some engineering I'm going to recommend also. I recommend to the op that nothing less then a tandem axle Kenworth with a minimum of 550 horsepower and a 15 spd tranny should work great providing he never loads his Radio Flyr wagon to gross weight. "You can never have too much truck." Might want to consider adding a tag or two just to be on the safe side.