See there are many suggestions for taming a carcharuhdauntosaurus some need metal gates end expensive stuff but the trick I want to tell you just works like magic without much resources.

1.you will need an argy or rhyniognatha and that's it

2. Just kill a creature using your mount and go to the creatures corpse and click on drag body in this method you can carry more weight without having much weight stat

3.try killing mammoths or rex if you manage to kill one and just drag that to the carcha when he is calm and stay close till carcha smells the body and don't go near him just let him come to you and eat that beleive me he will not bite you as soon as he eats the corpse just fly away if it's taming bar is not full .

4.and once allows you to ride hum just kill as much creature as you can rexes brontos and diplos are best

Note that.

Special thing about this technique is you won't need metal gateways or anything just a flying mount with decent weight cap like argentavis or rhyniognatha

.and remember you can use your rex too just set it on passive unclaim and kill it and carry it to carcha and with my trick a mid level player can carry a rex

Hope this trick helps 👍