I’ve camped in the Grand Canyon four times, three in Havasupai, (twice in tents and once in a small hotel in the Havasaupi Village and once at the historic Phantom Ranch). All are magical experiences.
But if you want to avoid the crowds, (yes, the trails are crowded even though camping permits are limited because of the fragile geography and fauna in the area), apply for a back country permit. . . No amenities. . .you pack it in and hope you don’t run out of what you need!