I am against a child sleeping apart from his bunkmates. That sets him from the beginning as a weirdo and the camp experience will add way more stress to him. If he cannot sleep discreetly with some type of Depends pull up, or medication is not indicated, perhaps he is not ready for camp yet.
Many kids are traumatized by camp when they have NO special issues. This one at age 10 is a biggie. Boys can be really cruel at this age. He should be restricting his liquid intake in thee vening altogether, and the counselor should wake him before he goes to sleep for the night himself, and make sure your son goes to the bathroom again. Other than than there is little that can be done. Hatzlacha.