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The difference between the listed GVWR and the GCWR, will be the tow weight rating. These numbers are on the vehicle weight sticker ; the sticker may be hidden ( mine is at the back of a kitchen cupboard), but it will be in the coach somewhere.
If you cannot find it then a call to the Freightliner free help line with the serial number will get you the info , including the hitch rating of the unit that was factory installed.
Here's a photo of the weight sticker.
NOTE to self: Re-read post before replying . The GVWR # and the GCWR # you list are identical to my 99 F/L chassis, and my tow rating is , 5,000 lbs. Sorry I've included so much extra info.
Many other coaches of this vintage with Cummins 330 HP, may be on Spartan chassis and those were rated for 10,000 lbs tow.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.