I have a 2011 KZ Sportsman toy hauler that I've had for 2.5 yrs and it has been a great unit. Not real fancy but well built. From my research, KZ builds light weight units that do not compromise quality of construction. The two year warranty is very nice also. Mine has thick, real plywood flooring and roof. I was just on the roof Monday checking my caulking and I don't feel any "give" in the roof when I walk on it. For extra safety, I upgraded to E rated tires, as my rims were rated for 80 pounds of pressure. The axles are plenty strong in terms of their rating.
The negative is a somewhat light carrying capacity. With the options on mine I only have about 2,300 pounds of carrying capacity for a 8,000 pound maximum.. This works for me as I don't travel with the water tank filled or heavy bikes. But, two Harley's and packed up would definitely be pushing it.