Why aren't plane engines mounted closer to each other or closer to the fuselage to reduce extra forces on the wings?
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Welcome, Mark! Please see https://aviation.stackexchange.com/questions/23375/how-do-you-choose-engine-placement-for-under-wings-engines and https://aviation.stackexchange.com/questions/1397/how-does-the-mounting-location-of-a-jet-engine-affect-aircraft-performance before asking. If the answers to both questions leave something open, refer to the existing answers so we know how to help you. – Peter Kämpf Jul 03 '17 at 18:47
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Placing the engines further out actually helps to relieve the load: in flight the wing provides lift and bends upwards, the fuselage hangs from the wings. – Koyovis Jul 03 '17 at 22:15
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Also, a practical but un-ignorable requirement, if they were closer to the body, they would be closer to the ground during takeoff and taxiing, and the need a certain ground clearance. This helps avoid ground strikes, and improves performance during takeoff by providing undisturbed air to the engines. Engines often create a ground vortex in the intake which sucks up any dirt or objects from the ground. The CFM 56 engine has an oval intake because it's quite close to the ground. – Penguin Aug 02 '17 at 10:24