PLUS-----That picture of Navy's wheel/trailer tie down strap mounting-----

I ain't getting into sin, co sin , tangents----------------- But----the forward inertia of a stop will cause the car to try to roll forward-up that angled stop piece, which will multiply many times force against the strap tension strength and/or the hold down mount of the trailer-The total force possible can also be multiplied by the G forces of the stop--------imagine an 3 g+ sudden stop-----

These tie down straps need to be at a lessor angle .