Had my first ramp check. It was easy and painless. Nice bunch of guys I had to deal with. They wanted my cert, medical, Id, and plane documents. Easy peasy.
The regulations do not say that. Any reliable method can used to insure that the airplane is operated within its operating limits, which includes things like its weight and balance and oil. If I computed W&B for myself and my flight bag and full, partial, and empty fuel in my usual rental months ago, and assuming the plane's empty W&B hasn't changed, I could skip the computation for today's flight.