Firstly, the Cyclone uses Lippert’s 12” I-beam that is capable far more than 18,000 pounds. The limiting factor is the other components attached to frame, such as the axle systems, the wheels and tires, the pin box, etc. BTW: The original Trial Air pin box before Lippert bought it was rated at 22,000 pounds.
Secondly, I’ll use my 4012 weights as an example. The GVWR is 20,400 pounds.
Before smart car in garage (8/6/10)
GVW: 17,800
Kingpin: 3,600 (Truck’s rear GAWR: 9,350)
1[SUP]st[/SUP] Axle: 4,975 (GAWR: 6,000)
2[SUP]nd[/SUP] Axle: 4,375
3[SUP]rd[/SUP] Axle: 4,850
Note: The above springs and axles proved to be inadequate and Lippert upgraded the axle system to GAWR of 7,000 pounds. So far that has proven to be a good thing.
The 4012’s garage is rated 2,500 pounds. With my smart car weighing in at 1,825 pounds and including all my other equipment in the garage, I'm confident that my garage weight is between 2,300 and 2,500 pounds.
After smart car in garage (6/14/11)
GVW: 19,750
Kingpin: 3,725
1[SUP]st[/SUP] Axle: 4,950 (GAWR: 7,000)
2[SUP]nd[/SUP] Axle: 5,375
3[SUP]rd[/SUP] Axle: 5,700
Lastly, you be the judge.