MT: First let me say WELCOME to iRV2.com
You have come to the right place for all sorts of information (some of it is pretty good)
about RVing!
To address your questions, let me say that your particular hitch was added by the coach builder-not WCC. It SHOULD have a label stating its capacity to tow, and the max tongue weight.
As for your W-22 chassis, you can move a total of 26,000 lbs GCWR. If your fully loaded coach only weighs 20,000 then you can pull a 6,000 toad-SUBJECT to the limits of the hitch and its mounting to the chassis. Have a competent hitch provider check yours-and replace with a heavier rated unit if necessary. But please don't overtax your W-22 by asking it to carry and tow more than the combined weight of 26,000. Also, PLEASE use a supplemental braking system on the toad to help stop all that weighty momentmum- lawyers love RVers who don't have additional braking equipment when pulling anything heavier than 1,000 lbs. ED