Any aeroplane can land back at MTOW in an emergency! They do it very easily. If they can take off from a runway, they can land back on it at MTOW. Even a B747-400 on fire will quite happily land back at that weight! But a fuel jettison system is fitted, usually to longer range aircraft as the spread between MTOW and MLW is so large- some 75 tonnes or so, and it may be necessary to lose fuel to minimum levels resulting in some 12+ hours burning up fuel without a jettison system.