Does a car dealership need to state in their contracts anything about repossesion?

First, the loan contract is not with the dealership. The dealership only represents the lender in the transaction.

Second, if the lender hopes to protect their interest, then the contract will state "something" about repossession. In fact one of the papers the borrower signs will be a Right to Cure, meaning essentially the borrower is giving future permission for the lender or the lender's agents to enter private property to secure the unit.