Rivian is 54" with tailgate closed, Gladiator is 60" with tailgate closed. Cybertruck actually has a 72" bed, but only at the floor. The back wall of the “cab” is overhung, so at the top of the bed the length is only 66".
The Cybertruck bed is also relatively narrow at 51", same as the Rivian. That being said, the Gladi…