Looks to me like the front wheels will climb up the rear end of those 'wood blocks' just at the right time to lift the belly of the Spyder a bit higher & stop it scraping on the top of the ramp; then as the back wheel starts to climb the ramp & in its own turn, lifts the belly clear of the top of the ramp, the front wheels will go down the other side of those blocks.

hyea:
It's effectively reducing the angle of the step up onto the ramp and the angle of the ramp over onto the trailer bed, basically extending the length of the angled ramp so that the belly of the Spyder doesn't/can't catch on the top of the ramp/rear edge of the trailer bed due to the Spyder's low ground clearance. I reckon it's a pretty smart way of doing it too! :thumbup: