How much weight can you haul with the sportchassies????????????

Just for example....

Truck GVWR 13,000
Trailer GVWR 20000
= 33,000 total GCVWR
- 12500 the scale wt of truck & trailer
= 20,500 The gross max wt of cargo

However, you gotta keep in mind that you will have to have that wt juuuust right... cause you can only put 20,000 on the trailer axles. Thats minus the wt of the trailer itself. My 40' was about 7,000 so, lets say your trailer is at 6,000. You can only put 14,000 of cargo wt on your trailer axles. If you know how to load it, you can load your product on the trailer but shift 6,500 lb of that 20,000 lb so that your truck is carrying that wt.
The idea here is the same thing as sliding the axles on a big truck, but your shifting cargo around in this situation. Just load a little extra all the way to the front & let the truck tote some of that wt.

Unless you know what your doing, I wouldn't advise you to put much more that about 12,000 lb on a trailer rated at 20,000.