I made plans for a new car ramp

I tried to hollow it out as much as possible to cut down on weight, while still making sure it’s overbuilt enough to support the corner of a 2000 kg pickup truck. I’m planning to use 98 × 48 mm lumber.

Open to suggestions on how to improve it. My only concern is the stop block - it’s not any higher than the previous steps. I could make the tire sit deeper in that “well,” but that would reduce the overall height.