I have about 1,650 PDF Owner's Manuals altogether, but I have yet to see a download-able version of a pre-2004 Dodge Manual. Free or otherwise.
You may have seen through the Dodge site where you can get a paper copy for $26.00 +shipping and handling;
https://techauthority.gltghosting.com/webapp/wcs/stores/servlet/ItemDisplay?catalogId=10051&storeId=10051&itemId=18250&langId=-1&categoryId=80120&parent_category_rn=80103&qty=0
Or you can get used ones from Cooters or other vendors. They have one at the moment for $14.42.
http://cootersautomanuals.com/catalog/advanced_search_result.php?categories_id=13&search_in_description=1&keywords=2000+Durango&x=47&y=8
Your best bet for the closest to free is to check at your local junkyard.