USARET: First let me say WELCOME to iRV2.com
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The W-22 chassis is rated to 26,000 lbs total combined weight. IF your coach only weighs 21,000 lbs without your toad, then you can tow 5000 lbs ASSUMING your hitch (not provided by WCC) is rated for at least that.
Most people assume they can only pull 4000 lbs because the chassis is rated to 22,000. However, how much you can pull is actually determined by your hitch rating and the actual weight of the loaded coach, before adding the toad's weight. ED