A four-inch rise from my shed to the ground may not seem significant, but it can be quite an annoying hassle to maneuver my lawn mower and snowblower in and out of. A ramp is definitely needed ...

I often attach a simple treated 2-by-4 to the face of the outer shed floor joist. This acts like a tiny beam to support the ends of the 4-by-4s that make up the supports for the ramp.